MODIFIED TITANIUM OXIDE FINE PARTICLE POWDER FOR MOLDED BODIES,
COMPOSITION FOR MOLDED BODIES, AND MOLDED BODY
5 TECHNICAL FIELD
[0001]
The present invention relates to a modified titanium
oxide-based fine particle powder for use in a molded article, and
to a composition for use in a molded article and a molded article
10 containing the modified titanium oxide-based fine particle
p01qder.
BACKGROUND ART
[ 0002]
Ceramic molded articles are produced by preparing a
15 composition for use in a ceramic molded article containing ceramic
powder, and by subjecting the composition to a molding process
such as extrusion molding, slip casting, compression molding (also
referred to as tablet molding) and the like, foll01qed by drying
step, and further by baking step.
20 [0003]
Extrusion molded articles can be formed into various known
shapes, such as the shape of a tablet, ring, pipe, honeycomb
(beehive) and the like. These molded articles are used as
catalyst carriers, catalysts or the like.
SF-2748 2
[0004]
For example, a honeycomb catalyst is used as a selective
reduction type NOx catalyst (hereinafter referred to as SCR
catalyst) for treating pollutants, particularly NOx, discharged
5 from stationary sources such as power plants and the like, or
mobile sources such as automobiles and the like.
[0005]
Conventionally, a honeycomb-structured molded article is
produced by preparing a composition by mixing a ceramic powder
10 with a catalyst component source, and then by subjecting the
composition to extrusion molding through a die, followed by drying
and baking. However, there are problems such as difficulty in
extrusion or occurrence of peeling of molded articles during the
extrusion molding, or occurrence of cracks or significant
15 shrinkage during the drying and baking.
[0006]
In vie1v of this, the present applicants have disclosed that
it is possible to reduce the shrinkage during the drying by mixing
a saturated fatty acid to the composition for use in a
20 honeycomb-structured molded article (Patent Document 1: JP
2009-226583 A) .
Further, JP 2011-240618 A (Patent Document 2) discloses an
additive for use in a ceramic extrusion molded article, containing
(a) a polyalkylene glycol fatty acid ester, and (b) a straight
SF-2748 3
chain unsaturated fatty acid having from 12 to 22 carbon atoms,
wherein the mass ratio of the polyalkylene glycol fatty acid ester
to the straight chain unsaturated fatty acid is (a) : (b) = 96 :
4 to 99 : 1. Patent Document 2 discloses that there is no specific
5 limitation on the method for adding the additive for use in a
ceramic extrusion molded article and on the embodiment in which
it is used, and that the additive may be added to a ceramic raw
material powder, or it may be added during the kneading or after
the preparation of a green body. However, Patent Document 2
10 discloses only an example in which cordierite is used as the
ceramic raw material powder, and is totally silent about the use
of titanium oxide particles, particularly, about the effect of
adding an additive for use in an extrusion molded article to
titanium oxide fine particles, in advance. In addition, Patent
15 Document 2 is also totally silent regarding the appropriate
particle size of the ceramic raw material powder to be used.
PRIOR ART DOCUMENTS
PATENT DOCUMENTS
[0007]
20 Patent Document 1: JP 2009-226583 A
Patent Document 2: JP 2011-240618 A
SUMMARY OF THE INVENTION
PROBLEMS TO BE SOLVED BY THE INVENTION
[0008]
SF-2748 4
For the purpose of further improving the performance or the
economic efficiency of the honeycomb catalysts, there is a need
for increasing the number of cells formed therein, as well as
improving the moldability, inhibition of cracks, strength,
5 abrasion resistance and the like, improving the catalyst
performance, and reducing the 1veight and the cell wall thickness,
of the honeycomb catalysts.
MEANS FOR SOLVING THE PROBLEMS
[0009]
10 In order to solve the above mentioned problems, the present
inventors have found, as a result of intensive studies, that by
adding a predetermined amount of a specific modifying agent to
a titanium oxide-based fine particle powder in advance, so as to
be carried thereby, the moldabili ty, inhibition of cracks,
15 strength, abrasion resistance and the like of the resulting molded
article can be improved. At the same time, they have found that
the improvement in the moldability thus obtained allows for a
reduction in the cell wall thickness of the molded article and
an increase in the number of cells formed therein compared to
20 conventional products, without compromising the strength,
abrasion resistance and the like, and thereby completing the
present invention.
[1] A modified titanium oxide-based fine particle powder for
use in a molded article, 1vhich powder is composed of titanium
5
SF-2748 5
oxide-based fine particles, wherein the titanium oxide-based fine
particles are modified by a modifying agent composed of a fatty
acid and/or a fatty acid ester, and wherein the content of the
modifying agent is within the range of from 0. 01 to 1. 5% by weight.
[ 2] The modified titanium oxide-based fine particle powder for
use in a molded article according to item [1], wherein the fatty
acid is a saturated fatty acid represented by the following formula
(1) and/or an unsaturated fatty acid represented by the following
formula ( 2) :
10 [0010]
CnH2n - C02H .................. ( 1)
(wherein n is an integer of from 4 to 23)
Cn' H2n' -2m+l - C02H .................. ( 2)
(1~herein n' is an integer of from 13 to 23, and m is an integer
15 of from 1 to 6 representing the number of double bonds) .
20
[3] The modified titanium oxide-based fine particle powder for
use in a molded article according to i tern [ 1], wherein the average
particle diameter of the modified titanium oxide-based fine
particles is within the range of from 0.03 to 2.5 ~m.
[4] The modified titanium oxide-based fine particle powder for
use in a molded article according to item [1], wherein the average
particle diameter of the titanium oxide-based fine particles is
within the range of from 0.03 to 2.0 ~m.
(5] The modified titanium oxide-based fine particle powder for
iii// SF-2748 6
-j
use in a molded article according to item (1], wherein the titanium
oxide-based fine particles comprises, along with titanium oxide,
at least one kind of oxide selected from tungsten oxide (W03),
molybdenum oxide (Mo03), silicon oxide ( Si02) and zirconium oxide
5 (Zr02), and wherein the content of the oxide(s) in the titanium
oxide-based fine particles is within the range of from 0. 5 to 4 0%
by weight.
[ 6] The modified titanium oxide-based fine particle powder for
use in a molded article according to any one of i terns [ 1] to [ 5],
10 wherein the ratio (WsT(%)) /(W(%)) of the weight reduction rate
(WsT(%)) of the modified titanium oxide-based fine particle powder
for use in a molded article whose water content is controlled to
15% by weight, as determined by the differential thermal analysis
when the temperature thereof is elevated from 30°C to 100°C, to
15 the weight reduction rate (W(%)) of the titanium oxide-based fine
particles whose water content is controlled to 15% by weight, as
determined by a differential thermal analysis when the temperature
thereof is elevated from 30°C to 100°C, is within the range of
from 1.02 to 1.20.
20 (7] A composition for use in a molded article, comprising:
(i) the modified titanium oxide-based fine particle powder
for use in a molded article according to any one of items [1] to
[ 6] 1
(ii) a reinforcing material, and
-::~v. ~/ SF-2748 7
l
(iii) an active ingredient precursor compound;
wherein, in the composition, (i) the content of the modified
titanium oxide-based fine particle powder for use in a molded
article is l'iithin the range of from 33 to 80.8% by weight, (ii)
5 the content of the reinforcing material is within the range of
from 1.8 to 12.8% by weight, and (iii) the content of the active
ingredient precursor compound in terms of oxide (s) is within the
range of from 0.0006 to 12.8% by weight; and
wherein the total solids concentration of the composition
10 is within the range of from 60 to 85% by weight.
[8] The composition for use in a molded article according to
item [7], further comprising a filler, wherein the content of the
filler in terms of solid is within the range of from 0. 6 to 12.8%
by weight.
15 [9] The composition for use in a molded article according to
item [7], further comprising an organic additive other than the
modifying agent in an amount within the range of from 0. 03 to 4. 5%
by \'Ieight.
[10] The composition for use in a molded article according to
20 item [7], \'/herein the active ingredient precursor compound is a
compound of at least one kind of element selected from the group
consisting of V, W, Mo, Cr, Mn, Fe, Ni, Cu, Ag, Au, Pd, Y, Ce,
Nd, In and Ir.
[11] A molded article, comprising:
SF-2748 8
(i) the modified titanium oxide-based fine particle powder for
use in a molded article according to any one of i terns [ 1] to [ 6],
(ii) a reinforcing material, and
(iii) an active ingredient;
5 wherein, (i) the content of the modified titanium
oxide-based fine particle powder for use in a molded article is
within the range of from 55 to 95% by weight, and
(ii) the content of the reinforcing material is within the range
of from 3 to 15% by weight, and (iii) the content of the active
10 ingredient in terms of oxide(s) is within the range of from 0.001
to 15% by weight.
[12] The molded article according to item [11] further comprising
a filler, wherein the content of the filler is within the range
of from 1 to 15% by weight.
15 [13] The molded article according to item [11] or [12], wherein
the molded article is a honeycomb-structured molded article and
wherein the honeycomb structure has an outer diameter within the
range of from 30 to 400 mm, a length within the range of from 3
to 1500 mm, a cell density within the range of from 6 to 500 cpsi
20 and a cell wall thickness within the range of from 0. 1 to 1. 5 mm.
[14] The molded article according to any one of items [11] to
[ 13], wherein the active ingredient is at least one kind of metal
element selected from V, W, Mo, Cr, Mn, Fe, Ni, Cu, Ag, Au, Pd,
Y, Ce, Nd, In and Ir; or a metal oxide(s) thereof.
iiii.!·.·/· ii/' SF-2748 9
[15] The molded article according to item [13], lvherein the cell
wall thickness of the molded article is within the range of from
0.1 to 0.3 mm.
EFFECT OF THE INVENTION
5 [0011]
In the present invention, a predetermined amount of a
specific modifying agent is added to the titanium oxide-based fine
particle powder in advance. Therefore, it is possible to produce
a honeycomb-structured molded article which has an improved
10 moldability, whose cell wall thickness and weight of articles can
be reduced even when the number of cells formed therein is
increased, andwhichisexcellentinstrength, abrasion resistance,
crack resistance and the like.
BRIEF DESCRIPTION OF THE DRAWINGS
15 [0012]
FIG. 1 is a graph showing the weight reduction curves of
the samples in Example 1, Example 6, Comparative Example 1 and
Comparative Example 4.
FIG. 2 is a graph showing the endothermic curves of the
20 samples in Example 1, Example 6, Comparative Example 1 and
Comparative Example 4.
MODE FOR CARRYING OUT THE INVENTION
[0013]
First, the modified titanium oxide-based fine particle
SF-2748 10
powder for use in a molded article of the present invention will
be described in details.
[Modified titanium oxide-based fine particle powder for use in
a molded article]
5 The modified titanium oxide-based fine particle powder for
use in a molded article according to the present invention is
composed of titanium oxide-based fine particles, wherein the
titanium oxide-based fine particles are modified by a modifying
agent composed of a fatty acid and/or a fatty acid ester.
10 [0014]
Titanium oxide-based fine particles
As the titanium oxide-based fine particles used in the
present invention, titanium oxide fine particles are used.
Further, titanium oxide composite based fine particles containing
15 at least one kind of oxide selected from tungsten oxide (W03),
molybdenum oxide (M03), silicon oxide (Si02) and zirconium oxide
( Zr02 ) can also be used. In cases 1vhere the titanium oxide
composite based fine particles containing tungsten oxide (W03),
molybdenum oxide (M03), silicon oxide (Si02), zirconium oxide
20 (Zr02 ) and/or the like is used, the content of the oxide (s) other
than titanium oxide is preferably within the range of 40% by weight
or less, more preferably, 30% by weight or less.
[0015]
If the content of the oxide(s) other than titanium oxide
SF-2748 11
inthetitaniumoxide-basedfineparticlesistoohigh, themolding
of the composition containing the fine particles may be difficult,
even if the modified titanium oxide-based fine particle powder
is used.
5 [0016]
Modifying agent
In the present invention, a fatty acid and/or a fatty acid
ester is used as the modifying agent.
[0017]
10 The fatty acid is preferably a saturated fatty acid
represented by the following formula (1) and/or an unsaturated
fatty acid represented by the following formula (2) .
[0018]
15 {1vherein n is an integer of from 4 to 23)
Cn• H2n' -2m+l - C02H .................. ( 2)
(wherein n' is an integer of from 13 to 23, and m is an integer
of from 1 to 6 representing the number of double bonds).
Specific examples of the saturated fatty acid include
20 stearic acid, lauric acid, myristic acid, behenic acid, arachidic
acid, lignoceric acid, palmitic acid and the like; and mixtures
thereof.
[0019]
Further, specific examples of the unsaturated fatty acid
~ ... ····.···/
.-··-.·.··.·.·.·.·.' / /
5
10
SF-2748 12
include oleic acid, arachidonic acid, linolic acid, linolenic acid,
eicosapentaenoic acid, docosahexaenoic acid and the like; and
mixtures thereof.
[0020]
As the fatty acid ester, a glycerin fatty acid ester
represented by the following formula is preferred.
[0021]
CH2·0CO·R
I
CHOH
I
CH2-0H
CH2·0H
I
CHO-COR
I
CH2-0H
CH2·0CO·R
I
CHOCOR
I
CH2-0H
CH2·0CO·R
I
CH-OH
I
CH2-0·COR
CH2·0CO·R
I
CHOCOR
I
CH2-0-COR
R is hydrocarbon group having 9 to 23 of carbon number.
Specific examples of the glycerin fatty acid include stearic
acid monoglyceride, palmitic acid monoglyceride, oleic acid
monoglyceride, stearic acid diglyceride, oleic acid diglyceride,
behenic acid monoglyceride, caprylic acid monoglyceride,
caprylic acid diglyceride, caprylic acid triglyceride and the
15 like; and mixtures thereof.
[0022]
The content of the modifying agent in the modified titanium
oxide-based fine particle powder for use in a molded article is
preferably within the range of from 0. 01 to 1. 5% by weight, more
20 preferably from 0.02 to 1.0% by weight.
[0023]
If the content of the modifying agent in the modified
l
!
SF-2748 13
titanium oxide-based fine particle powder for use in a molded
article is too low, a sufficient effect of improving the
moldability, particularly during the extrusion molding, may not
be obtained. If the content of the modifying agent is too high,
5 when the molded article to be described later is prepared, the
volume of micropores in the resulting molded article tend to
increase, resulting in an insufficient compressive strength.
[0024]
If the content of the modifying agent in the modified
10 titanium oxide-based fine particle p01vder for use in a molded
article is within the above mentioned range, an excellent
moldability can be obtained, and a molded article excellent in
compressive strength, abrasion resistance, crack resistance and
the like can be prepared. Because of the excellent moldability,
15 in particular, it is possible to prepare a molded article having
a complex structure, such as a honeycomb-structured molded article,
and thus, a lightweight honeycomb-structured molded article
having a thin cell wall thickness can be obtained.
[0025]
20 The modified titanium oxide-based fine particle powder for
use in a molded article is an aggregate of the modified titanium
oxide-based fine particles, and the average particle diameter of
the titanium oxide-based fine particles which are not yet modified
is preferably within the range of from 0.03 to 2.0 pm, more
SF-2748 14
l
preferably from 0.30 to 1.50 pm.
[0026]
Further, the average particle diameter of the modified
titanium oxide-based fine particles is preferably within the range
5 of from 0. 03 to 2. 5 pm, more preferably from 0. 30 to 2. 0 pm. If
the content of the modifying agent is high, the titanium oxide
fine particles may be coated with the modifying agent, and if the
content of the modifying agent is low, the modifying agent may
be absorbed onto a portion of the surface of the titanium oxide
10 fine particle, although it varies depending on the content of the
modifying agent and the average particle diameter of the titanium
oxide fine particles. Thus, existence of the modifying agent on
the surface of the titanium oxide-based fine particles serves to
improve the moldability.
15 [0027]
When the average particle diameter of the modified titanium
oxide-based fine particles is within the above mentioned range,
an excellent moldability can be obtained, and the resulting molded
article has an excellent compressive strength, abrasion
20 resistance, crack resistance and the like.
[0028]
The modified titanium oxide-based fine particle powder for
use in a molded article as described above can be prepared as
follows.
SF-2748 15
[0029]
The modified titanium oxide-based fine particle powder for
use in a molded article can be prepared by mixing the titanium
oxide-based fine particles having the above mentioned
5 predetermined average particle diameter with a predetermined
amount of a modifying agent.
[0030]
The mixing method is not particularly limited, as long as
the titanium oxide-based fine particles can be homogeneously mixed
10 to the extent permitted for the titanium oxide-based fine
particles, and any of the conventionally known mixing methods can
be used.
[0031]
Examples of the mixing method include those using a kneader,
15 blender, mixer and the like.
[0032]
It is preferred that the fine particles and the modifying
agent be heated during the mixing, and the heating temperature
is generally within the range of from 40 to 120°C, although it
20 varies depending on the type (melting temperature and the like)
of the modifying agent. In addition, a volatile solvent such as
ethanol can be used 1vhen the modification is carried out.
[0033]
The duration of mixing varies depending on the temperature,
SF-2748 16
but it is from 0.25 to 5 hours, in general.
Next, the ratio (WsT (%) ) I (W (%) ) of the weight reduction rate
(WsT (%) ) , associated with the desorption of water, of the modified
titanium oxide-based fine particle powder for use in a molded
5 article whose water content is controlled to 15% by weight, as
determined by the differential thermal analysis when the
temperature thereof is elevated from 30°C 100°C, to the weight
reduction rate (W (%)), associated 1~i th the desorption of water,
of the titanium oxide-based fine particles 1~hose water content
10 is controlled to 15% by weight, as determined by a differential
thermal analysis when the temperature thereof is elevated from
30 °C to 100 °C, is within the range of from 1. 02 to 1. 20, preferably,
from 1.03 to 1.15.
15
[0034]
It is not certain as to the reason why the weight reduction
rate of the modified titanium oxide-based fine particle powder
for use in a molded article as determined by the differential
thermal analysis is increased. However, it is considered as
follows. If the ratio (WsT(%)) /(W(%)) is within the above
20 mentioned range, when the composition for use in a molded article
to be described later is prepared, even though the water contents
in the raw material mixtures of the titanium oxide fine particles
and of the modified titanium oxide-based fine particle powder for
use in a molded article are the same during the mixing and kneading
SF-2748 17
under heating at around 100°C, the composition containing the
modified titanium oxide-based fine particle powder for use in a
molded article appears as if it contains a higher amount of water,
because of the water desorbing therefrom under heating at around
5 100 °C, which leads to increasing the effect of mixing and kneading,
thereby allowing for preparation of the composition for use in
a molded article, which is excellent in moldability.
[0035]
Further, the modified titanium oxide-based fine particle
10 powder for use in a molded article according to the present
invention not only has a high amount of water desorption when the
temperature thereof is elevated from 30°C to 100°C, but also has
a tendency that the bottom temperature of the endothermic peak
shifts to the higher temperature region, associated with the
15 desorption of water.
The weight reduction rate was measured using a differential
thermal analyzer (manufactured by Rigaku Corporation:
differential type differential thermal balance: TG8120 high
temperature, high sensitivity type differential scanning
20 calorimeter: DSC8230 standard model), and using approximately 10
mg of a sample, when the temperature of the sample was elevated
from 30°C to 100°C at a temperature rise rate of 5.0°C /min, under
an air atmosphere.
[Composition for use in a molded article]
SF-2748 18
l I
The composition for use in a molded article according to
the present invention is a composition including: (i) the modified
titanium oxide-based fine particle powder for use in a molded
article, (ii) a reinforcing material, and (iii) an active
5 ingredient precursor compound.
[0036]
Modified titanium oxide-based fine particle powder for use in a
molded article
As the modified titanium oxide-based fine particle powder
10 for use in a molded article, the above mentioned modified titanium
oxide-based fine particle powder for use in a molded article is
used.
[0037]
The content of the modified titanium oxide-based fine
15 particle powder for use in a molded article, in the composition
for use in a molded article, in terms of solid, is preferably within
the range of from 33 to 80.8% by weight, more preferably from 40
to 75% by weight.
[0038]
20 If the content of the modified titanium oxide-based fine
particle powder for use in a molded article, in the composition
for use in a molded article, is too low, the molding of the
composition may be difficult, and the catalyst performance of the
resulting molded article, for example, the NOx removal efficiency
SF-2748 19
~,
I
of a selective reduction type NOx catalyst made of the composition,
may be insufficient.
[0039]
If the content of the modified titanium oxide-based fine
5 particle powder for use in a molded article, in the composition
for use in a molded article, is too high, on the other hand, the
content of other materials such as the reinforcing material,
filler and active ingredient precursor to be described later will
be reduced as a result thereof, and it may result in an insufficient
10 moldability, and insufficient compressive strength, crack
resistance and catalyst performance of the resulting molded
article.
[0040]
Reinforcing material
15 As the reinforcing material, a fibrous reinforcing material
such as a glass fiber or ceramic fiber can be used.
[0041]
When the reinforcing material as described above is
contained, occurrence of cracks in the resulting molded article
20 due to shrinkage during the drying after the extrusion molding
can be inhibited, and a molded article excellent in compressive
strength and abrasion resistance can be prepared.
[0042]
The content of the reinforcing material in the composition
5
SF-2748 20
for use in a molded article, in terms of solid, is preferably within
the range of from 1.8 to 12.8% by weight, more preferably from
3 to 10% by weight.
[0043]
If the content of the reinforcing material in the
composition for use in a molded article is too low, the cracks
may occur in the resulting molded article due to shrinkage during
the drying after the extrusion molding. If the content of the
reinforcing material in the composition for use in a molded article
10 is too high, on the other hand, there are cases where the
15
reinforcing material clogs to a mold for molding during the
extrusion molding, thereby compromising the moldability.
[0044]
Active ingredient precursor compound
As the active ingredient precursor compound, a compound of
at least one kind of element selected from the group consisting
of V, W, Mo, Cr, Mn, Fe, Ni, Cu, Ag, Au, Pd, Y, Ce, Nd, In and
Iris used. Since the active ingredient functions as a catalyst,
it is selected as appropriate depending on the purpose.
20 [0045]
Specific examples of the active ingredient precursor
compound include ammonium metavanadate, vanadic sulfate,
ammonium paratungstate, ammonium metatungstate, tungstic acid,
ammonium molybdate, chromium nitrate, chromium acetate,
SF-2748 21
manganese nitrate, manganese acetate, palladium nitrate, ferrous
sulfate, nickel nitrate, copper nitrate, silver nitrate, yttrium
nitrate, cerium nitrate, gold chloride, iridium chloride and the
like.
5 [0046]
The content of the active ingredient precursor compound in
the composition for use in a molded article is preferably within
the range of from 0. 0006 to 12.8% by weight, more preferably from
0.3 to 10% by weight.
10 [0047]
If the content of the active ingredient precursor compound
is too low, there are cases where, when the resulting molded
article is used as a selective reduction type NOx catalyst, the
NOx removal efficiency of the catalyst may be insufficient.
15 [0048]
If the content of the active ingredient precursor compound,
in terms of oxide (s), is too high, on the other hand, the
moldability may be reduced and the compressive strength and crack
resistance of the resulting molded article becomes insufficient.
20 [0049]
Filler
The composition for use in a molded article according to
the present invention may contain a filler. If the filler is
contained, the composition may be subjected to extrusion molding
SF-2748 22
continuously, and at the same time, a molded article excellent
in compressive strength and abrasion resistance can be prepared.
[ 0050 l
Examples of the filler which can be used in the composition
5 include ceramic powder such as a powder of cordierite, alumina,
zirconia, silicon ·nitride, silicon carbide, clay mineral and the
like.
[0051)
The content of the filler in the composition for use in a
10 molded article, in terms of solid, is preferably within the range
of from 0.6 to 12.8% by weight, more preferably from 3 to 10% by
weight.
[0052)
If the content of the filler in the composition for use in
15 a molded article is too low, there are cases where the moldabili ty
in continuous extrusion molding may be reduced, and thus the
molding of a molded article having a long length, particularly,
a honeycomb-structured molded article having a long length,
becomes difficult; and at the same time, an increased number of
20 cleaning or replacement of the mold for molding may be required,
thereby reducing the productivity and the economic efficiency.
If the content of the filler in the composition for use in a molded
article is too high, on the other hand, the catalyst performance
of the resulting molded article may be insufficient.
SF-2748 23
[0053]
Organic additive
The composition for use in a molded article of the present
invention may contain an organic additive, in addition to the above
5 mentioned modifying agent.
[0054]
Examples of the organic additive include carboxymethyl
cellulose, methyl cellulose, hydroxypropyl cellulose,
hydroxymethyl cellulose, crystalline cellulose, polyethylene
10 glycol, Polypropylene glycol, polyethylene oxide and the like.
[0055]
If such an organic additive is contained in the composition,
the effect of improving the releasability from the molding die,
moldability and the like can be obtained.
15 [0056]
20
The content of the organic additive in the composition for
use in a molded article is preferably within the range of from
0. 03 to 4. 3% by weight, more preferably from 0. 5 to 2% by weight.
[0057]
Too low a content of the organic additive in the composition
for use in a molded article may result in an insufficient
moldability, while too high a content may increase the volume of
micropores in the obtained molded article catalyst, resulting in
an insufficient compressive strength thereof, and occurrence of
SF-2748 24
cracks during the baking of the molded article.
[0058]
Composition
The composition for use in a molded article contains a
5 solvent, in addition to the above mentioned components. The
solvent is selected as appropriate depending on the purpose of
use and the molding method.
[0059]
Specific examples of the solvent include volatile solvents
10 suc\1 as water, methanol, ethanol, propanol and methyl ethyl ketone.
Specifically, water is preferred.
[0060]
The total solids concentration of the above mentioned
composition for use in a molded article is preferably within the
15 range of from 60 to 85% by weight, more preferably, from 65 to
75% by weight.
[0061]
If the total solids concentration of the composition for
use in a molded article is too low, the resulting molded article
20 after the extrusion and before the drying may have poor shape
retention properties, and there is a risk that the molded article
could deform.
[0062]
If the total solids concentration of the composition for
SF-2748 25
use in a molded article is too high, on the other hand, the slippage
of the composition when passing through the molding die may be
reduced, resulting in a decrease in the moldabili ty, particularly,
in the moldability in continuous extrusion.
5 [0063]
Except for using the above mentioned modified titanium
oxide-based fine particle powder, the composition for use in a
molded article according to the present invention can be prepared,
using a conventional method.
10 [0064]
For example, when a selective reduction type NOx catalyst
is produced, it can be prepared by mixing the modified titanium
oxide-based fine particle powder, a reinforcing material, an
active ingredient precursor compound and water; and a filler and
15 an organic additive which are used as required; such that the
contents thereof be within the above mentioned predetermined range,
followed by mixing, kneading and the like.
[0065]
The mixing and kneading are preferably carried out under
20 heating. The heating temperature used at this time is preferably
within the range of from about 80 to 140°C, more preferably, from
90 to 130°C, By carrying out the mixing and kneading within the
temperature range as described above, a composition for use in
a molded article excellent in moldability can be prepared.
SF-2748 26
[Molded article]
The molded article according to the present invention
contains (i) the modified titanium oxide-based fine particle
powder for use in a molded article, (ii) a reinforcing material,
5 and (iii) an active ingredient.
[0066]
The content of the modified titanium oxide-based fine
particle powder for use in a molded article, in the molded article,
is preferably within the range of from 55 to 95% by weight, more
10 preferably from 70 to 80% by weight.
[0067]
If the content of the modified titanium oxide-based fine
particle powder for use in a molded article, in the molded article,
is too low, the molding of the molded article may be difficult,
15 and at the same time, the catalyst performance thereof, for example,
the NOx removal efficiency of a selective reduction type NOx
catalyst containing the fine particle powder, may be insufficient.
[0068]
If the content of the modified titanium oxide-based fine
20 particle powder for use in a molded article, in the molded article,
is too high, on the other hand, the content of the other materials
such as the reinforcing material, filler and active ingredient
precursor is reduced as a result thereof, and it may result in
an insufficient moldability, compressive strength, crack
SF-2748 27
l
resistance and catalyst performance of the molded article.
[0069]
The content of the reinforcing material in the molded
article, in terms of solid, is preferably within the range of from
5 3 to 15% by weight, more preferably, from 3 to 10% by weight.
[0070)
Too low a content of the reinforcing material in the molded
article leads to a poor strength, while too high a content of the
reinforcing material results in a poor productivity and a
10 decreased amount of an active ingredient contained in the molded
article, which ingredient functions as a catalyst.
[0071)
The content of the filler in the molded article, in terms
of solid, is preferably within the range of from 1 to 15% by weight,
15 more preferably, from 3 to 10% by weight. Too low a content of
the filler in the molded article may result in a poor strength,
1vhile too high a content of the filler may lead to an insufficient
catalyst performance.
[0072)
20 The active ingredient is one induced from the above
mentioned precursor, and is at least one kind of metal element
selected from V, W, Mo, Cr, Mn, Fe, Ni, Cu, Ag, Au, Pd, Y, Ce,
Nd, In and Ir; or a metal oxide(s) thereof.
[0073]
SF-2748 28
As the active ingredient, specifically, there may be
mentioned metals such as V, W, Mo, Cr, Mn, Fe, Ni, Cu, Ag, Au,
Pd, Y, Ce, Nd, In, Ir and the like; and/or metal oxides such as
VzOs, W03, M03, Crz03, MnOz, Mnz03, Fez03, NiO, CuO, AgzO, AuO, PdO,
5 Y203, Ce02 , Nd205 , In203, IrO and the like; and mixtures thereof.
[0074]
The content of the active ingredient in the molded article,
in terms of oxide(s), is preferably within the range of from 0.001
to 15% by weight, more preferably, from 0. 3 to 12% by weight. If
10 the content of the active ingredient is too low, there are cases
where, when the molded article is used as a selective reduction
type NOx catalyst, the NOx removal efficiency of the catalyst may
be insufficient. Too high a content of the active ingredient,
on the other hand, results in an insufficient compressive strength
15 and crack resistance of the molded article.
[0075]
The molded article according to the present invention can
be formed into various conventionally known shapes, such as the
shape of a pellet, bead, ring, honeycomb and the like. Since the
20 use of the above mentioned modified titanium oxide-based fine
particle powder according to the present invention allows for a
significant improvement in the moldability, it is suitable for
producing a honeycomb-structured molded article, particularly a
thin, honeycomb-structured molded article, the molding of which
SF-2748 29
has been conventionally difficult.
[0076]
In the present invention, the use of the above mentioned
composition allmvs for an excellent moldabili ty, and a
5 honeycomb-structured molded article excellent in strength and
abrasion resistance can be obtained. At the same time, because
of the excellent moldability, it is possible to produce a molded
article which has a thin cell wall thickness and in 1·1hich a large
number of cells are formed.
10 [0077]
The outer diameter of the honeycomb-structured molded
article is preferably within the range of from 30 to 400 mm.
[0078]
The external shape of the honeycomb structure is not
15 particularly limited, and it can be selected as appropriate
depending on its application and usage, from various shapes such
as a tetragon, hexagon, polygon such as octagon or one having more
vertices than the octagon, circle, ellipse and the like.
20
[0079]
There is no advantage in producing the honeycomb-structured
molded article having an outer diameter of less than 30 mm. If
the molded article of this size is used as a honeycomb-structured
selective reduction type NOx catalyst, it only increases the
number of the molded articles to be produced, required to produce
SF-2748 30
the same effect, making it economically inefficient. There also
is no advantage in producing the honeycomb-structured molded
article having an outer diameter of more than 400 mm, and there
is no extrusion molding machine available therefor.
5 [0080]
10
The length of the honeycomb-structured molded article is
preferably within the range of from 3 to 1500 mm, more preferably,
from 50 to 1300 mm.
[0081]
The honeycomb-structured molded article whose length is
less than 3 mm is difficult to produce.
[0082]
The honeycomb-structured molded article whose length is
greater than 1500 mm has little application.
15 [0083]
20
The cell density of the honeycomb-structured molded article
is preferably within the range of from 6 to 500 cpsi, more
preferably, from 15 to 200 cpsi.
[0084]
The cell density of the honeycomb-structured molded article
of less than 6 cpsi results in a large size of aperture and poor
shape retention properties.
[0085]
The cell density of the honeycomb-structured molded article
SF-2748 31
of greater than 500 cpsi, on the other hand, increases the pressure
loss during the molding, thereby complicating the molding.
[0086]
The cell wall thickness of the honeycomb-structured molded
5 article is preferably within the range of from 0.1 to 1. 5 mm, more
preferably, from 0.1 to 0.3 mm.
[0087]
The honeycomb-structured molded article having a cell wall
thickness of less than 0. 1 mm is difficult to obtain, even if the
10 above mentioned modified titanium oxide-based fine particles are
used.
[0088]
The honeycomb-structured molded article having a cell \vall
thickness of greater than 1. 5 mm can be produced using a
15 conventionally known method, without using the above mentioned
modified titanium oxide-based fine particles.
[0089]
In the present invention, the honeycomb-structured molded
article preferably has a cell wall thickness within the range of
20 from 0. 1 to 0. 3 mm, in particular.
[0090]
According to the present invention, it is possible to obtain
a lightweight honeycomb-structured molded article which has a thin
cell wall thickness and in which a large number of cells are formed,
SF-2748 32
which molded article is excellent in strength, abrasion resistance,
compressive strength, and economic efficiency.
[0091]
The molded article according to the present invention can
5 be produced by a conventionally known method, using the above
mentioned composition for use in a molded article.
[0092]
The molded article can be formed into various conventionally
known shapes, such as the shape of a pellet, bead, ring, honeycomb
10 and the like, by appropriately selecting a mold for use in the
extrusion molding.
[0093]
In the present invention, a thin honeycomb-structured
molded article which is excellent particularly in strength and
15 abrasion resistance can be obtained. If a vacuum extrusion
molding machine is used in the production thereof, it is possible
to stably produce a honeycomb-structured molded article which has
no cracks and which is even more excellent in strength and abrasion
resistance.
20 [Example]
The present invention will now be described with reference
to Examples. It should be noted, however, that the present
invention is in no 1~ay limited by the following Examples.
[Example 1]
SF-2748 33
Preparation of modified titanium oxide-based fine particle powder
(1) for use in a molded article
A quantity of 78.3 kg of metatitanic acid slurry
(manufactured by ISHIHARA SANGYO KAISHA, LTD.) was charged into
5 a mixing vessel equipped with a heat circulation apparatus, and
2. 82 kg of ammonium para tungstate was added, followed by mixing.
To the resultant, 30.5 kg of aqueous ammonia having a concentration
of 15% by weight was added to adjust the pH of the mixture to 9. 5,
and then the mixture was allowed to age while stirring at 95°C
10 for 1 hour. The mixed slurry was then cooled to 40°C, filtered,
and washed with splashing water to prepare a washed cake having
a solids concentration (Ti02 , W03 ) of 49% by weight. The \vashed
cake contained 3.0% by weight of S04 and 0.03% by weight of Na20
on a dry weight basis.
15 [0094]
Then the washed cake was dried at 110°C for 20 hours and
baked at 550°C for 5 hours, followed by grinding using a grinder,
to obtain a titanium oxide-based fine particle powder (1) composed
of a composite oxide {Ti0z-W03 , weight ratio: Ti02 I W03 = 90 I 10)
20 of titanium oxide and tungsten oxide.
[0095]
The average particle diameter of the obtained titanium
oxide-based fine particle powder (1) was measured according to
the following method, and the result is sh01m in the Table. The
SF-2748 34
composition (mixing standard) is also shown in the Table.
[0096)
The average particle diameter and the particle size
distribution of the obtained fine particle powder were measured
5 using a Laser Diffraction/ Scattering Particle Size Distribution
Analyzer (LA-300; manufactured by HORIBA, Ltd.) . The measurement
conditions were as follows: the fine particle powder 1vas dispersed
in an aqueous dispersion medium; ultrasound was irradiated for
3 minutes; and the concentration of the fine particle powder was
10 adjusted so as to achieve a laser light transmittance of 85%.
[0097)
The water desorption rate (W%) of the obtained titanium
oxide-based fine particle powder (1) was also measured, and the
result is shown in the Table. In addition, the weight reduction
15 curve thereof is shown in FIG. 1, and the endothermic curve thereof
is shown in FIG. 2 (since the fine particle powder is not modified,
it corresponds to Comparative Example 1 to be described later).
[0098)
Then 23.5 kg of the resulting titanium oxide-based fine
20 particle powder ( 1) and 23. 5 g of stearic acid as a modifying agent
1vere mixed using a kneader for 20 minutes while heating to 120 °C,
to obtain a modified titanium oxide-based fine particle powder
(1) for use in a molded article.
[0099)
SF-2748 35
The average particle diameter and the water desorption rate
(WsT%) of the obtained modified titanium oxide-based fine particle
powder (1) for use in a molded article were measured, and the
results are shown in the Table. In addition, the weight reduction
5 curve thereof is shown in FIG. 1, and the endothermic curve thereof
is shown in FIG.2.
The content of the modifying agent in the modified titanium
oxide-based fine particle powder (1) for use in a molded article,
at this time, is 0.1% by weight, based on the amount used.
10 [ 010 0 l
The average particle diameter of the modified titanium
oxide-based fine particle powder (1) for use in a molded article
was measured in the same way as the titanium oxide-based fine
particle powder (1).
15 [0101]
Preparation of composition (1) for use in a molded article
To 23. 5 kg of the modified titanium oxide-based fine
particle powder (1) for use in a molded article, a solution
obtained by dissolving 1.28 kg of ammonium metavanadate as V20 5
20 in 0.375 kg of monoethanolamine was added. To the resultant,
aqueous ammonia and 1vater were added to adjust the pH of the
resulting mixed slurry to 9. The mixture was then kneaded for
0.5 hours using a kneader, while heating at 120°C. Then, to the
resultant, 1. 25 kg of glass fiber (chopped strand 03 DE, length:
SF-2748 36
3 mm, fiber diameter: 5 ~m; manufactured by Owens Corning LLC.)
as a reinforcing material, 1. 25 kg of Fuller's Earth as a filler,
and 0. 5 kg of polyethylene oxide as an organic additive were added,
followed by further kneading for 1. 5 hours, to prepare a
5 composition (1) for use in a molded article.
[0102]
The content (based on the amount used) of each of the
components in the composition (1) for use in a molded article are
shown in the Figure.
10 [0103]
The water content in the composition was measured using an
infrared moisture meter (FD-610; manufactured by KETT Electric
Laboratory) .
[0104]
15 Preparation of molded article (1)
The composition ( 1) for use in a molded article was subjected
to an extrusion molding using a vacuum extrusion molding machine,
and molded into the shape of honeycomb, to obtain a honeycomb
structure (1).
20 [0105]
The moldability of the obtained honeycomb structure (1) was
evaluated according to the following standard, and the result is
shown in the Table.
[0106]
SF-2748 37

The moldability of the honeycomb structure was evaluated
as follows. Those in which the flow from the die face upon
extrusion molding was stable, and in which no defects have occurred
5 inside the honeycomb catalyst during the 10 minutes of the
continuous extrusion molding, were evaluated as"@". Those in
1vhich the initial flow was stable, but in which some defects have
occurred inside the honeycomb catalyst during the 10 minutes of
the continuous extrusion molding, were evaluated as "o". On the
10 other hand, those in which the initial flow was unstable, and in
which some defects have occurred inside the honeycomb catalyst,
were evaluated as "f1". Those which did not come out from the die
15
face were evaluated as "x".
[0107]
The honeycomb structure (1) 1vas then dried at 60°C for 48
hours, followed by baking at 530°C for 3 hours 1 to prepare a molded
article (1) having a honeycomb structure.
[0108]
The dimensions of the molded article (1) were measured1 and
20 the results are shown in the Table. The content of each of the
components in the molded article (1) (based on the amount used)
is also shown in the Table (The ratio of Ti02 /W03 /V20 5 /GF /Fuller 1 s
Earth in terms of weight is 77.4 /8.6 /4 /5 /5).
Further, the specific surface area 1 volume of micropores,
SF-2748 38
compressive strength and NOx removal catalyst performance of the
molded article (1) were measured according to the following
methods, and the results are shown in the Table.
[0109]
5
The specific surface area of the honeycomb-structured
exhaust gas treatment catalyst is measured using a specific
surface area measuring apparatus based on the BET method, using
as an adsorption gas, a mixed gas of 30% nitrogen and 70% helium.
10 [0110]

The volume of micropores was measured using a micropore
distribution measuring apparatus based on mercury penetration
method (PM-33GT1LP; manufactured by QANTA CROME). The pressure
15 range used was from 32 to 32200 psi.
[0111]

The compressive strength is measured using a compressive
strength tester (AL/B30P Model; manufactured by TOKYO TESTING
20 MACHINE). To a sample of the molded article (1) cut out in a cube
or rectangular parallelepiped, a compressive load is applied at
a constant rate in the direction in which honeycomb cells extend
and in the direction perpendicular to the above mentioned
direction (hereinafter, also merely referred to as "perpendicular
5
SF-2748 39
direction"), and the maximum load (N) at which the sample is
destroyed is read, and the compressive strength is calculated
according to the following formula (4):
[ 0 112]
The compressive strength: (N/cm2
) = W(N) I {a(cm) x
c (em) } ............ ( 4)
wherein a (em) and c (em) represent the dimensions of the two
sides of the surface of the sample to which the pressure was applied,
and W(N) represents the maximum load at which the sample was
10 completely destroyed when the load was gradually increased.
[0113]

The molded article (1) was cut into a test sample having
honeycomb cells of 5 x 5, and a length of 200 mm, and the test
15 sample \vas charged into a circulation type reactor. A model gas
having the following composition was circulated in the circulation
type reactor and the NOx removal efficiency of the sample was
measured. The concentration of nitrogen oxide (NOxl in the gas
before and after the contact with the catalyst was measured, and
20 the NOx removal efficiency of the catalyst was calculated
according to the following formula (5). The concentration of the
NOx was measured using a chemiluminescent nitrogen oxide analyzer.
[0114]
NOx removal efficiency (%) = ( (NOx in the gas before the
v·········.
f
SF-2748 40
contact with catalyst (mass ppm) - NOx in the gas after the contact
with catalyst (mass ppm)) /NOx in the gas before the contact with
catalyst (mass ppm)} x 100 ............ (5)
Test conditions
5 Catalyst shape: 5 x 5 honeycomb cells, length: 200 mm
Reaction temperature: 350°C, SV = 40,000 hr-1
Model gas composition: NOx = 100 mass ppm, NH3 = 100 mass
ppm, 02 = 7% by weight, H20 = 10% by weight, N2 = balance
[Example 2]
10 Preparation of modified titanium oxide-based fine particle powder
(2) for use in a molded article
The same procedure as in Example 1 was carried out except
that 4.7 g of stearic acid was used as the modifying agent, to
obtain a modified titanium oxide-based fine particle p01vder (2)
15 for use in a molded article.
[0115]
The average particle diameter and the water desorption rate
(WsT%) of the modified titanium oxide-based fine particle powder
(2) for use in a molded article were measured, and the results
20 are shown in the Table. The content of the modifying agent is
also shown in the Table.
[0116]
Preparation of composition (2) for use in a molded article
The same procedure as in Example 1 was carried out except
SF-2748 41
that the modified titanium oxide-based fine particle powder (2)
for use in a molded article was used, to prepare a composition
(2) for use in a molded article.
[ 0117]
5 The content of each of the components in the composition
(2) for use in a molded article is shown in the Table.
[0118]
Preparation of molded article (2)
The same procedure as in Example 1 was carried out except
10 that the composition (2) for use in a molded article was used,
to obtain a molded article (2) .
[0119]
The evaluation of the moldability and the measurement of
the dimensions of the resulting molded article (2) were carried
15 out at this time, and the results are shown in the Table. The
content of each of the components in the molded article (2) is
also shown the Table.
[0120]
Further, the specific surface area, volume of micropores,
20 compressive strength and NOx removal catalyst performance of the
molded article (2) 1~ere measured, and the results are shown in
the Table.
[Example 3]
Preparation of modified titanium oxide-based fine particle powder
_-;J /
§1/f/ SF-2748 42
(3) for use in a molded article
The same procedure as in Example 1 was carried out except
that 11.8 g of stearic acid 1~as used as the modifying agent, to
prepare a modified titanium oxide-based fine particle·powder (3)
5 for use in a molded article.
[ 0 121]
The average particle diameter and the water desorption rate
(WsT%) of the modified titanium oxide-based fine particle powder
(3) for use in a molded article were measured, and the results
10 are shown in the Table. The content of the modifying agent is
also shown in the Table.
[0122]
Preparation of composition {3) for use in a molded article
The same procedure as in Example 1 was carried out except
15 that the modified titanium oxide-based fine particle po1~der ( 3)
for use in a molded article was used, to prepare a composition
(3) for use in a molded article.
[0123]
The content of each of the components in the composition
20 (3) for use in a molded article is shown in the Table.
[ 012 4]
Preparation of molded article (3)
The same procedure as in Example 1 1~as carried out except
that the composition (3) for use in a molded article was used,
SF-2748 43
to obtain a molded article (3) .
[0125]
The evaluation of the moldability and the measurement of
the dimensions of the resulting molded article (3) were carried
5 out at this time, and the results are shown in the Table. The
content of each of the components in the molded article (3) is
also shown the Table.
[ 012 6]
Further, the specific surface area, volume of micropores,
10 compressive strength and NOx removal catalyst performance of the
molded article (3) were measured, and the results are shown in
the Table.
[Example 4]
Preparation of modified titanium oxide-based fine particle p01vder
15 (4) for use in a molded article
The same procedure as in Example 1 was carried out except
that 47.0 g of stearic acid was used as the modifying agent, to
obtain a modified titanium oxide-based fine particle powder (4)
for use in a molded article.
20 [0127]
The average particle diameter and the water desorption rate
(WsT%) of the modified titanium oxide-based fine particle powder
(4) for use in a molded article were measured, and the results
are shown in the Table. The content of the modifying agent is
SF-2748 44
also shown in the Table.
[0128]
Preparation of composition (4) for use in a molded article
The same procedure as in Example 1 was carried out except
5 that the modified titanium oxide-based fine particle powder ( 4)
for use in a molded article was used, to prepare a composition
(4) for use in a molded article.
[0129]
The content of each of the components in the composition
10 (4) for use in a molded article is shown in the Table.
[0130]
Preparation of molded article (4)
The same procedure as in Example 1 was carried out except
that the composition (4) for use in a molded article was used,
15 to obtain a molded article (4).
[0131]
The evaluation of the moldability and the measurement of
the dimensions of the resulting molded article (4) were carried
out at this time, and the results are shown in the Table. The
20 content of each of the components in the molded article (4) is
also shown the Table.
[0132]
Further, the specific surface area, volume of micropores,
compressive strength and NOx removal catalyst performance of the
SF-2748 45
molded article (4) were measured, and the results are shown in
the Table.
[Example 5]
Preparation of modified titanium oxide-based fine particle powder
5 (5) for use in a molded article
The same procedure as in Example 1 was carried out except
that 117.5 g of stearic acid was used as the modifying agent, to
obtain a modified titanium oxide-based fine particle powder (5)
for use in a molded article.
10 [0133]
The average particle diameter and the 1vater desorption rate
(WsT%) of the modified titanium oxide-based fine particle powder
(5) for use in a molded article were measured, and the results
are shown in the Table. The content of the modifying agent is
15 also shown in the Table.
[0134]
Preparation of composition (5) for use in a molded article
The same procedure as in Example 1 was carried out except
that the modified titanium oxide-based fine particle powder (5)
20 for use in a molded article was used, to prepare a composition
(5) for use in a molded article.
[0135]
The content of each of the components in the composition
(5) for use in a molded article is shown in the Table.
SF-2748 46
[0136]
Preparation of molded article (5)
The same procedure as in Example 1 was carried out except
that the composition (5) for use in a molded article was used,
5 to obtain a molded article (5).
[0137]
The evaluation of the moldability and the measurement of
the dimensions of the resulting molded article (5) were carried
out at this time, and the results are shown in the Table. The
10 content of each of the components in the molded article (5) is
also shown the Table.
[0138]
Further, the specific surface area, volume of micropores,
compressive strength and NOx removal catalyst performance of the
15 molded article (5) were measured, and the results are shown in
the Table.
[Example 6]
Preparation of modified titanium oxide-based fine particle powder
(6) for use in a molded article
20 The same procedure as in Example 1 was carried out except
that 188 g of stearic acid was used as the modifying agent, to
obtain a modified titanium oxide-based fine particle powder (6)
for use in a molded article.
[0139]
SF-2748 47
The average particle diameter and the water desorption rate
(WsT%) of the resulting modified titanium oxide-based fine
particle powder (6) for use in a molded article were measured,
and the results are shown in the Table. In addition, the weight
5 reduction curve thereof is shown in FIG. 1, and the endothermic
curve thereof is shown in FIG.2.
The composition (based on the amount used) is also shown
in the Table.
[0140]
10 Preparation of composition (6) for use in a molded article
The same procedure as in Example 1 was carried out except
that the modified titanium oxide-based fine particle powder (6)
for use in a molded article was used, to prepare a composition
(6) for use in a molded article.
15 [0141]
The content (based on the amount used) of each of the
components in the composition (6) for use in a molded article is
shown in the Table.
[0142]
20 Preparation of molded article (6)
The same procedure as in Example 1 was carried out except
that the composition (6) for use in a molded article was used,
to obtain a molded article (6).
[0143]
=o/ ~/ SF-2748 48
The evaluation of the moldability and the measurement of
the dimensions of the resulting molded article (6) were carried
out at this time, and the results are shown in the Table. The
content (based on the amount used) of each of the components in
5 the molded article (6) is also shown the Table.
[0144]
Further, the specific surface area, volume of micropores,
compressive strength and NOx removal catalyst performance of the
molded article (6) were measured, and the results are shown in
10 the Table.
[Example 7]
Preparation of modified titanium oxide-based fine particle p01vder
(7) for use in a molded article
The same procedure as in Example 1 was carried out to obtain
15 a titanium oxide-based fine particle poNder ( 7) . A quantity of
23.5 kg of the resulting titanium oxide-based fine particle powder
{7), and 100 ml of a solution obtained by dissolving 23.5 g of
stearic acid in ethanol, as a modifying agent, lvere mixed for 20
minutes, followed by drying in a constant temperature tank
20 controlled to 40 ± 5°C, to prepare a modified titanium oxide-based
fine particle powder (7) for use in a molded article.
[0145]
The average particle diameter and the \Vater desorption rate
(WsT%) of the modified titanium oxide-based fine particle powder
! SF-2748 49
(7) for use in a molded article Here measured, and the results
are shoHn in the Table. The content of the modifying agent is
also shoHn in the Table.
[0146]
5 Preparation of composition (7) for use in a molded article
The same procedure as in Example 1 Has carried out except
that the modified titanium oxide-based fine particle poHder (7)
for use in a molded article Has used, to prepare a composition
(7) for use in a molded article.
10 [0147]
15
The content of each of the components in the composition
(7) for use in a molded article is shoHn in the Table.
[0148]
Preparation of molded article (7)
The same procedure as in Example 1 1vas carried out except
that the composition (7) for use in a molded article \vas used,
to obtain a molded article (7) .
[0149]
The evaluation of the moldability and the measurement of
20 the dimensions of the resulting molded article ( 7) Here carried
out at this time, and the results are shoHn in the Table. The
content of each of the components in the molded article (7) is
also shoHn the Table.
[0150]
SF-2748 50
Further, the specific surface area, volume of micropores,
compressive strength and NOx removal catalyst performance of the
molded article (7) were measured, and the results are shown in
the Table.
5 [Example 8]
Preparation of modified titanium oxide-based fine particle powder
(8) for use in a molded article
The same procedure as in Example 1 was carried out except
that 23.5 g of lauric acid was used as the modifying agent, to
10 obtain a modified titanium oxide-based fine particle powder ( 8)
for use in a molded article.
[0151]
The average particle diameter and the water desorption rate
(WsT%) of the modified titanium oxide-based fine particle powder
15 ( 8) for use in a molded article were measured, and the results
are shown in the Table. The content of the modifying agent is
also shown in the Table.
20
[0152]
Preparation of composition (8) for use in a molded article
The same procedure as in Example 1 was carried out except
that the modified titanium oxide-based fine particle powder (8)
for use in a molded article was used, to prepare a composition
(8) for use in a molded article.
[0153]
5
SF-2748 51
The content of each of the components in the composition
(8) for use in a molded article is shown in the Table.
[0154]
Preparation of molded article (8)
The same procedure as in Example 1 was carried out except
that the composition (8) for use in a molded article was used,
to obtain a molded article (8).
[0155]
The evaluation of the moldability and the measurement of
10 the dimensions of the resulting molded article (8) were carried
out at this time, and the results are shown in the Table. The
content of each of the components in the molded article (8) is
also shown the Table.
15
[0156]
Further, the specific surface area, volume of micropores,
compressive strength and NOx removal catalyst performance of the
molded article (8) were measured, and the results are shown in
the Table.
[Example 9]
20 Preparation of modified titanium oxide-based fine particle powder
(9) for use in a molded article
The same procedure as in Example 1 was carried out except
that 23.5 g of myristic acid was used as the modifying agent, to
obtain a modified titanium oxide-based fine particle powder (9)
SF-2748 52
for use in a molded article.
[0157]
The average particle diameter and the water desorption rate
(WsT%) of the modified titanium oxide-based fine particle powder
5 (9) for use in a molded article were measured, and the results
are sh01vn in the Table. The content of the modifying agent is
also shown in the Table.
10
[ 0158]
Preparation of composition (9) for use in a molded article
The same procedure as in Example 1 was carried out except
that the modified titanium oxide-based fine particle powder (9)
for use in a molded article was used, to prepare a composition
(9) for use in a molded article.
[0159]
15 The content of each of the components in the composition
(9) for use in a molded article is shown in the Table.
[0160]
Preparation of molded article (9)
The same procedure as in Example 1 was carried out except
20 that the composition (9) for use in a molded article was used,
to obtain a molded article (9).
[0161]
The evaluation of the moldability and the measurement of
the dimensions of the resulting molded article (9) were carried
5
SF-2748 53
out at this time, and the results are shown in the Table. The
content of each of the components in the molded article (9) is
also shown the Table.
[0162)
Further, the specific surface area, volume of micropores,
compressive strength and NOx removal catalyst performance of the
molded article (9) were measured, and the results are shown in
the Table.
[Example 10)
10 Preparation of modified titanium oxide-based fine particle powder
(10) for use in a molded article
The same procedure as in Example 1 was carried out except
that 23. 5 g of palmi tic acid \vas used as the modifying agent to
obtain a modified titanium oxide-based fine particle powder (10)
15 for use in a molded article.
[0163)
The average particle diameter and the water desorption rate
(WsT%) of the modified titanium oxide-based fine particle powder
(10) for use in a molded article were measured, and the results
20 are shown in the Table. The content of the modifying agent is
also shown in the Table.
[0164)
Preparation of composition (10) for use in a molded article
The same procedure as in Example 1 was carried out except
SF-2748 54
that the modified titanium oxide-based fine particle powder (10)
for use in a molded article was used, to prepare a composition
(10) for use in a molded article.
[0165]
5 The content of each of the components in the composition
(10) for use in a molded article is shown in the Table.
[0166]
Preparation of molded article (10)
The same procedure as in Example 1 was carried out except
10 that the composition (10) for use in a molded article was used,
to obtain a molded article (10).
[0167]
The evaluation of the moldability and the measurement of
the dimensions of the resulting molded article (10) were carried
15 out at this time, and the results are shown in the Table. The
content of each of the components in the molded article (10) is
also shown the Table.
[0168]
Further, the specific surface area, volume of micropores,
20 compressive strength and NOx removal catalyst performance of the
molded article (10) were measured, and the results are shown in
the Table.
[Example 11]
Preparation of modified titanium oxide-based fine particle powder
SF-2748 55
(11) for use in a molded article
The same procedure as in Example 1 was carried out except
that 23.5 g of oleic acid was used as the modifying agent, to obtain
a modified titanium oxide-based fine particle powder (11) for use
5 in a molded article.
[0169]
The average particle diameter and the water desorption rate
(WsT%) of the modified titanium oxide-based fine particle powder
(11) for use in a molded article were measured, and the results
10 are shown in the Table. The content of the modifying agent is
also shown in the Table.
[0170]
Preparation of composition (11) for use in a molded article
The same procedure as in Example 1 was carried out except
15 that the modified titanium oxide-based fine particle powder (11)
for use in a molded article was used, to prepare a composition
(11) for use in a molded article. The content of each of the
components in the composition (11) for use in a molded article
is shown in the Table.
20 [0171]
Preparation of molded article (11)
The same procedure as in Example 1 was carried out except
that the composition (11) for use in a molded article was used,
to obtain a molded article (11).
SF-2748 56
[0172]
The evaluation of the moldability and the measurement of
the dimensions of the resulting molded article (11) were carried
out at this time, and the results are shown in the Table. The
5 content of each of the components in the molded article (11) is
also shown the Table.
[0173]
Further, the specific surface area, volume of micropores,
compressive strength and NOx removal catalyst performance of the
10 molded article ( 11) were measured, and the results are shown in
the Table.
[Example 12]
Preparation of modified titanium oxide-based fine particle powder
(12) for use in a molded article
15 The same procedure as in Example 1 was carried out except
20
that 23.5 g of stearic acid monoglyceride was used as the modifying
agent, to obtain a modified titanium oxide-based fine particle
powder (12) for use in a molded article.
[0174]
The average particle diameter and the water desorption rate
(WsT%) of the modified titanium oxide-based fine particle powder
(12) for use in a molded article were measured, and the results
are shown in the Table. The content of the modifying agent is
also shown in the Table.
SF-2748 57
[0175]
Preparation of composition (12) for use in a molded article
The same procedure as in Example 1 was carried out except
that the modified titanium oxide-based fine particle powder ( 12)
5 for use in a molded article was used, to prepare a composition
(12) for use in a molded article.
[0176]
The content of each of the components in the composition
(12) for use in a molded article is shown in the Table.
10 [0177]
Preparation of molded article (12)
The same procedure as in Example 1 was carried out except
that the composition (12) for use in a molded article was used,
to obtain a molded article (12).
15 [ 017 8]
The evaluation of the moldability and the measurement of
the dimensions of the resulting molded article (12) 1vere carried
out at this time, and the results are shown in the Table. The
content of each of the components in the molded article (12) is
20 also sh01vn the Table.
[0179]
Further, the specific surface area, volume of micropores,
compressive strength and NOx removal catalyst performance of the
molded article (12) were measured, and the results are shown in
5
SF-2748
the Table.
[Example 13]
58
Preparation of modified titanium oxide-based fine particle powder
(13) for use in a molded article
A quantity of 78.3 kg of metatitanic acid slurry
(manufactured by ISHIHARA SANGYO KAISHA, LTD.) was charged into
a mixing vessel equipped with a heat circulation apparatus, and
1. 97 kg of ammonium para tungstate, 18. 8 kg of acidic silicic acid
solution having a Si02 concentration of 4. 0% by weight, which
10 solution is obtained by dealkalization of a water glass solution
using a cation exchange resin, were added, followed by mixing.
To the resultant, 30.5 kg of aqueous ammonia having a concentration
of 15% by weight was added to adjust the pH of the mixture to 9. 5,
and then the mixture was allowed to age while stirring at 95°C
15 for 1 hours stirring. The mixed slurry was then cooled to 40°C,
filtered, and washed with splashing water to prepare a washed cake
having a solids concentration (Ti02 , W03 , Si02) of 50% by weight.
The washed cake contained 3. 0% by weight of 804 and 0. 03% by weight
of Na20, on a dry weight basis.
20 [0180]
Then the washed cake was dried at 110°C for 20 hours,
followed by baking at 550°C for 5 hours , to obtain a titanium
oxide-based fine particle powder (13) composed of a composite
oxide (Ti02-WOrSi02 , weight ratio: Ti02 /W03 /Si02 = 90/ 7 I 3) of
SF-2748 59
titanium oxide, tungsten oxide and silica.
[0181]
The average particle diameter of the resulting titanium
oxide-basedfineparticlepowder (13) was measured, andtheresult
5 is shown in the Table. The composition (mixing standard) is also
shown in the Table. Further, the water desorption rate (W%) was
measured, and the result is shown in the Table.
[0182]
The same procedure as in Example 1 was carried out except
10 that titanium oxide-based fine particle powder ( 13) was used, to
prepare a modified titanium oxide-based fine particle powder (13)
for use in a molded article.
[0183]
The average particle diameter and the water desorption rate
15 (WsT%) of the modified titanium oxide-based fine particle p01vder
(13) for use in a molded article were measured, and the results
are shown in the Table. The content of the modifying agent is
also shown in the Table.
[0184]
20 Preparation of composition (13) for use in a molded article
The same procedure as in Example 1 was carried out except
that the modified titanium oxide-based fine particle powder ( 13)
for use in a molded article was used, to prepare a composition
(13) for use in a molded article.
SF-2748 60
[0185]
The content of each of the components in the composition
(13) for use in a molded article is shown in the Table.
[0186]
5 Preparation of molded article ( 13)
10
The same procedure as in Example 1 was carried out except
that the composition (13) for use in a molded article was used,
to obtain a molded article (13).
[0187]
The evaluation of the moldability and the measurement of
the dimensions of the resulting molded article ( 13) were carried
out at this time, and the results are shown in the Table. The
content of each of the components in the molded article (13) is
also shown the Table.
15 [0188]
Further, the specific surface area, volume of micropores,
compressive strength and NOx removal catalyst performance of the
molded article (13) were measured, and the results are shown in
the Table.
20 [Comparative Example 1]
Preparation of titanium oxide-based fine particle powder (Rl) for
use in a molded article
The same procedure as in Example 1 was carried out except
that no modifying agent was used, to prepare a titanium oxide-based
----;fv §!if/
.1"
SF-2748 61
fine particle p01vder (Rl) for use in a molded article.
[0189]
The average particle diameter of the titanium oxide-based
fine particle powder (Rl) for use in a molded article was measured,
5 and the result is shown in the Table.
[ 0190 l
Preparation of composition (Rl) for use in a molded article
The same procedure as in Example 1 was carried out except
that the titanium oxide-based fine particle powder (Rl) for use
10 in a molded article was used, to prepare a composition (Rl) for
use in a molded article.
[0191]
The content of each of the components in the composition
(Rl) for use in a molded article is shown in the Table.
15 [0192]
Preparation of molded article (Rl)
The same procedure as in Example 1 was carried out except
that the composition (R1) for use in a molded article was used.
However, clogging occurred soon after the start of the extrusion
20 molding, and it was unable to carry out the molding.
[Comparative Example 2]
Preparation of titanium oxide-based fine particle powder (R2) for
use in a molded article
The same procedure as in Example 13 was carried out except
SF-2748 62
that no modifying agent was used, to prepare a titanium oxide-based
fine particle powder (R2) for use in a molded article.
[ 0 193]
The average particle diameter of the titanium oxide-based
5 fine particle powder (R2) for use in a molded article was measured,
and the result is shown in the Table.
[0194]
Preparation of composition (R2) for use in a molded article
The same procedure as in Example 1 was carried out except
10 that the titanium oxide-based fine particle powder (R2) for use
in a molded article was used, to prepare a composition (R2) for
use in a molded article.
[0195]
The content of each of the components in the composition
15 (R2) for use in a molded article is shown in the Table.
[0196]
Preparation of molded article (R2)
The same procedure as in Example 1 was carried out except
that the composition (R2) for use in a molded article was used.
20 However, clogging occurred soon after the start of the extrusion
molding, and it \vas unable to carry out the molding.
[Comparative Example 3]
Preparation of composition (R3) for use in a molded article
To 23.5 kg of the titanium oxide-based fine particle powder
SF-2748 63
(1) prepared in the same way as in Example 1, a solution obtained
by dissolving 1.28 kg of ammonium metavanadate as V20 5 in 0.375
kg of monoethanolamine was added. To the resultant, 23.5 g of
stearic acid was added, and then aqueous ammonia and water were
5 further added to adjust the pH of the mixed slurry to 9. The
mixture was then kneaded using a kneader, while heating at ll0°C.
[0197]
Then, to the resultant, 1.25 kg of glass fiber (chopped
strand 03 DE, length: 3 mm, fiber diameter: 5 ~m; manufactured
10 by Owens Corning LLC.) as a reinforcing material, 1.25 kg of
Fuller's Earth as a filler, and 0.5 kg of polyethylene oxide as
an organic additive were added, followed by further kneading, to
prepare a composition (1) for use in a molded article.
15
[0198]
The content of each of the components in the composition
(R3) for use in a molded article is shown in the Table.
[0199]
Preparation of molded article (R3)
The same procedure as in Example 1 was carried out except
20 that the composition (R3) for use in a molded article was used,
to obtain a molded article (R3) .
[0200]
The evaluation of the moldability and the measurement of
the dimensions of the resulting molded article (R3) were carried
5
SF-2748 64
out at this time, and the results are shown in the Table. The
content of each of the components in the molded article (R3) is
also shown the Table.
[0201]
Further, the specific surface area, volume of micropores,
compressive strength and NOx removal catalyst performance of the
molded article (R3) were measured, and the results are shmm in
the Table.
[Comparative Example 4]
10 Preparation of titanium oxide-based fine particle powder (R4) for
use in a molded article
The same procedure as in Example 1 was carried out except
that 1175 g of stearic acid was used as the modifying agent, to
prepare a titanium oxide-based fine particle powder (R4) for use
15 in a molded article. The average particle diameter and the water
desorption rate (WsT%) of the titanium oxide-based fine particle
powder (R4) for use in a molded article were measured, and the
results are shown in the Table. In addition, the weight reduction
curve thereof is shown in FIG. 1, and the endothermic curve thereof
20 is shown in FIG.2. The content of the modifying agent is also
shown in the Table.
Preparation of composition (R4) for use in a molded article
The same procedure as in Example 1 \vas carried out except
that the titanium oxide-based fine particle powder (R4) for use
SF-2748 65
in a molded article was used, to prepare a composition (R4) for
use in a molded article.
[0202]
The content of each of the components in the composition
5 (R4) for use in a molded article is shown in the Table.
Preparation of molded article (R4)
The same procedure as in Example 1 was carried out except
that the composition (R4) for use in a molded article was used,
to obtain a molded article (R4).
10 [0203]
The evaluation of the moldability and the measurement of
the dimensions of the resulting molded article (R4) were carried
out at this time, and the results are shown in the Table. The
content of each of the components in the molded article (R4) is
15 also shown the Table.
[0204]
Further, the specific surface area, volume of micropores,
compressive strength and NOx removal catalyst performance of the
molded article (R4) were measured, and the results are shown in
20 the Table.
[Comparative Example 5]
Preparation of titanium oxide-based fine particle powder (R5) for
use in a molded article
The same procedure as in Example 1 was carried out except
5
SF-2748 66
that 1.2 g of stearic acid was used as the modifying agent, to
obtain a titanium oxide-based fine particle powder (R5) for use
in a molded article.
[0205]
The average particle diameter and the water desorption rate
(WsT%) of the titanium oxide-based fine particle powder (R5) for
use in a molded article were measured, and the results are sh01-1n
in the Table. The content of the modifying agent is also shown
in the Table.
10 Preparation of composition (R5) for use in a molded article
The same procedure as in Example 1 was carried out except
that the titanium oxide-based fine particle powder (R5) for use
in a molded article was used, to prepare a composition (R5) for
use in a molded article.
15 [0206]
The content of each of the components in the composition
(R5) for use in a molded article is shown in the Table.
Preparation of molded article (R5)
The same procedure as in Example 1 was carried out except
20 that the composition (R5) for use in a molded article was used,
to obtain a molded article (R5).
[0207]
The evaluation of the moldability and the measurement of
the dimensions of the resulting molded article (R5) were carried
5
SF-2748 67
out at this time, and the results are shown in the Table. The
content of each of the components in the molded article (R5) is
also shown the Table.
[0208]
Further, the specific surface area, volume of micropores,
compressive strength and NOx removal catalyst performance of the
molded article (R5) were measured, and the results are shown in
the Table.
[Example 14]
10 Preparation of modified titanium oxide-based fine particle powder
(14) for use in a molded article
A quantity of 87.0 kg of metatitanic acid slurry
(manufactured by ISHIHARA SANGYO KAISHA, LTD.) was charged into
a mixing vessel equipped with a heat circulation apparatus, and
15 20.5 kg of aqueous ammonia having a concentration of 15% by weight
was added to adjust the pH of the mixture to 9.5. The mixture
was then allowed to age while stirring at 95°C for 1 hour. The
mixed slurry was then cooled to 40°C, filtered, and washed with
splashing water to obtain a washed cake having a solids
20 concentration (Ti02 ) of 4 9% by weight. The washed cake contained
3. 0% by weight of S04 and 0. 03% by weight of Na20, on a dry weight
basis.
[0209]
Then the washed cake was dried at 110 °C for 20 hours,
SF-2748 68
followed by baking at 540°C for 5 hours, to obtain a titanium
oxide-based fine particle po1vder ( 14) composed of titanium oxide
( Ti02 ) • The average particle diameter of the titanium oxide-based
fine particle powder (14) was measured, and the result is shown
5 in the Table. The composition (mixing standard) is also shown
in the Table. Further, the water desorption rate (W%) was
measured, and the result is shown in the Table.
[0210]
The same procedure as in Example 1 was carried out except
10 that the titanium oxide-based fine particle powder ( 14) was used,
to obtain a modified titanium oxide-based fine particle p01vder
( 14) for use in a molded article. The average particle diameter
and the water desorption rate (WsT%) of the modified titanium
oxide-based fine particle powder ( 14) for use in a molded article
15 were measured, and the results are shown in the Table. The content
of the modifying agent is also shown in the Table.
Preparation of composition (14) for use in a molded article
The same procedure as in Example 1 was carried out except
that the modified titanium oxide-based fine particle pOivder ( 14)
20 for use in a molded article was used, to prepare a composition
(14) for use in a molded article. The content of each of the
components in the composition (14) for use in a molded article
is shown in the Table.
Preparation of molded article (14)
5
SF-2748 69
The same procedure as in Example 1 was carried out except
that the composition (14) for use in a molded article was used,
to prepare a molded article (14).
[ 0211]
The evaluation of the moldability and the measurement of
the dimensions of the resulting molded article ( 14) were carried
out at this time, and the results are shown in the Table. The
content of each of the components in the molded article (14) is
also shown the Table.
10 [0212]
Further, the specific surface area, volume of micropores,
compressive strength and NOx removal catalyst performance of the
molded article (14) were measured, and the results are shown in
the Table.
15 [Comparative Example 6]
Preparation of titanium oxide-based fine particle powder (R6) for
use in a molded article
The same procedure as in Example 14 was carried out except
that the modifying agent was not used, to prepare a titanium
20 oxide-based fine particle powder (R6) for use in a molded article.
The average particle diameter of the titanium oxide-based fine
particle powder (R6) for use in a molded article was measured,
and the result is shown in the Table.
Preparation of composition (R6) for use in a molded article
SF-2748 70
The same procedure as in Example 1 was carried out except
that the titanium oxide-based fine particle powder (R6) for use
in a molded article was used, to prepare a composition (R6) for
use in a molded article. The content of each of the components
5 in the composition (R6) for use in a molded article is shown in
the Table.
Preparation of molded article (R6)
The same procedure as in Example 1 was carried out except
that the composition (R6) for use in a molded article was used,
10 to obtain a molded article (R6) .
[0213]
The evaluation of the moldability and the measurement of
the dimensions of the resulting molded article (R6) were carried
out at this time, and the results are shown in the Table. The
15 content of each of the components in the molded article (R6) is
also shown the Table.
[0214]
Further, the specific surface area, volume of micropores,
compressive strength and NOx removal catalyst performance of the
20 molded article (R6) were measured, and the results are shown in
the Table.

CLAIMS
1. A modified titanium oxide-based fine particle powder for
use in a molded article, which powder is composed of titanium
oxide-based fine particles, wherein the titanium oxide-based fine
5 particles are modified by a modifying agent composed of a fatty
acid and/or a fatty acid ester, and wherein the content of the
modifying agent is within the range of from 0. 01 to 1. 5% by weight.
2. The modified titanium oxide-based fine particle powder for
use in a molded article according to claim 1, wherein the fatty
10 acid is a saturated fatty acid represented by the following formula
(1) and/or an unsaturated fatty acid represented by the following
formula ( 2) :
15
CnH2n - C02H .................. ( 1)
(wherein n is an integer of from 4 to 23)
Cn' H2n' -2m+l - C02H .................. ( 2)
(wherein n' is an integer of from 13 to 23, and m is an integer
of from 1 to 6 representing the number of double bonds).
3. The modified titanium oxide-based fine particle powder for
use in a molded article according to claim 1, wherein the average
20 particle diameter of the modified titanium oxide-based fine
particles is within the range of from 0.03 to 2.5 ~m.
4. The modified titanium oxide-based fine particle powder for
use in a molded article according to claim 1, wherein the average
particle diameter of the titanium oxide-based fine particles is
SF-2748 77
within the range of from 0.03 to 2.0 ~m.
5. The modified titanium oxide-based fine particle powder for
use in a molded article according to claim 1, wherein the titanium
oxide-based fine particles comprises, along with titanium oxide,
5 at least one kind of oxide selected from tungsten oxide (W03 ),
molybdenum oxide (Mo03), silicon oxide (Si02 ) and zirconium oxide
(Zr02), and wherein the content of the oxide(s) in the titanium
oxide-based fine particles is within the range of from 0. 5 to 4 0%
by weight.
10 6. The modified titanium oxide-based fine particle powder for
use in a molded article according to any one of claims 1 to 5,
wherein the ratio (W8.(%)) /(W(%)) of the weight reduction rate
(WsT (%) ) of the modified titanium oxide-based fine particle powder
for use in a molded article whose water content is controlled to
15 15% by weight, as determined by the differential thermal analysis
1vhen the temperature thereof is elevated from 30°C to 100°C, to
the 1veight reduction rate (W(%)) of the titanium oxide-based fine
particles whose 1vater content is controlled to 15% by weight, as
determined by a differential thermal analysis when the temperature
20 thereof is elevated from 30°C to 100°C, is within the range of
from 1.02 to 1.20.
7. A composition for use in a molded article, comprising:
(i) the modified titanium oxide-based fine particle p01vder
for use in a molded article according to any one of claims 1 to
SF-2748 78
6,
(ii) a reinforcing material, and
(iii) an active ingredient precursor compound;
wherein, in the composition, (i) the content of the modified
5 titanium oxide-based fine particle powder for use in a molded
article is within the range of from 33 to 80.8% by weight, (ii)
the content of the reinforcing material is within the range of
from 1. 8 to 12. 8% by weight, and (iii) the content of the active
ingredient precursor compound in terms of oxide (s) is within the
10 range of from 0.0006 to 12.8% by weight; and
wherein the total solids concentration of the composition
is within the range of from 60 to 85% by weight.
8. The composition for use in a molded article according to
claim 7, further comprising a filler, wherein the content of the
15 filler in terms of solid is within the range of from 0. 6 to 12. 8%
by weight.
9. The composition for use in a molded article according to
claim 7, further comprising an organic additive other than the
modifying agent in an amount within the range of from 0. 03 to 4. 5%
20 by weight.
10. The composition for use in a molded article according to
claim 7, wherein the active ingredient precursor compound is a
compound of at least one kind of element selected from the group
consisting of V, W, Mo, Cr, Mn, Fe, Ni, Cu, Ag, Au, Pd, Y, Ce,
SF-2748 79
Nd, In and Ir.
11. A molded article, comprising:
(i) the modified titanium oxide-based fine particle pov1der for
use in a molded article according to any one of claims 1 to 6,
5 (ii) a reinforcing material, and
(iii) an active ingredient;
wherein, (i) the content of the modified titanium
oxide-based fine particle powder for use in a molded article is
1vithin the range of from 55 to 95% by weight, and
10 (ii) the content of the reinforcing material is within the range
of from 3 to 15% by weight, and (iii) the content of the active
ingredient in terms of oxide(s)is within the range of from 0.001
to 15% by weight.
12. The molded article according to claim 11 further comprising
15 a filler, wherein the content of the filler is within the range
of from 1 to 15% by weight.
13. The molded article according to claim 11 or 12, wherein the
molded article is a honeycomb-structured molded article and
wherein the honeycomb structure has an outer diameter within the
20 range of from 30 to 400 mm, a length within the range of from 3
to 1500 mm, a cell density within the range of from 6 to 500 cpsi
and a cell wall thickness within the range of from 0.1 to 1. 5 mm.
14. The molded article according to any one of claims 11 to 13,
wherein the active ingredient is at least one kind of metal element
SF-2748 80
selected from V, w, Mo, Cr, Mn, Fe, Ni, Cu, Ag, Au, Pd, Y, Ce,
Nd, In and Ir; or a metal oxide(s) thereof.
15. The molded article according to claim 13, wherein the cell
wall thickness of the molded article is within the range of from
5 0.1 to 0.3 mm.