CLIAMS:1.A process for preparing a dispersed noble metal-containing catalyst, the process comprising; (a) contacting a pretreated acidic porous material with at least one metal ion complexed with a ligand in a solvent having dielectric constant in a range of 25-45 to obtain a metal ion exchanged acidic porous material; (b) calcining the metal ion exchanged acidic porous material at a temperature of 300-600 °C to obtain a calcined mixture; (c) incorporating the calcined mixture with a noble metal to obtain a noble metal loaded acidic porous material; (d) drying the noble metal loaded acidic porous material to obtain a dried material; (e) extruding 50% w/w to 95 % w/w of the dried material with 5 % w/w to 50 % w/w of a binder material to obtain a extruded catalyst; and
(f) calcining the extruded catalyst at 250-400 °C under constant air flow to obtain a dispersed noble metal-containing catalyst having dispersion of over 90%.

2.The process as claimed in claim 1, wherein the acidic porous material is selected from the group consisting of zeolite, molecular sieve, amorphous silica-alumina, solid acids and mixtures thereof, preferably selected from the group consisting of ZSM-5, ZSM-22, ZSM-23, ZSM-35, and ZSM-48.
3.The process as claimed in claim 1, wherein the acidic porous material is pretreated by converting the Na-form of the acidic porous material to obtain the H-form of the acidic porous material.

4.The process as claimed in claim 1, wherein the pretreated acidic porous material is selectively exchanged with at least one metal ion complex prior to noble metal loading.

5.The process as claimed in claim 1, wherein the metal ion is selected from the group consisting of Group IIA metals, rare earth metals, and mixtures thereof, preferably selected from the group consisting of Ca2+, Ba2+, Mg2+, Sr2+, La2+, Ce3+ and mixtures thereof.

6.The process as claimed in claim 1, wherein the ligand is an organic ligand, preferably a supramolecule able to form stable metallo-macrocycles with the metal ion.

7.The process as claimed in claim 6, wherein the supramolecule is selected from the group consisting of 1,4,10,13-tetraoxa-7,16-diazacyclooctadecane, 4,7,13,16,21,24-hexaoxa-1,10-diazabicyclo[8.8.8]hexacosane, 4,7,13,16,21-pentaoxa-1,10-diaza(8,8,5)-tricosane, 4,7,10,16,19,24,27-heptaoxa-1,13-diazabicyclo[11.8.8]-nonacosane and their substituted derivatives.

8.The process as claimed in claim 1, wherein the solvent is selected from the group consisting of acetonitrile, methanol, and mixtures thereof.

9.The process as claimed in claim 1, wherein the noble metal is selected from the group consisting of Group–VIII noble metal and mixtures of Group-VIII noble metals, preferably Pt.

10.The process as claimed in claim 1, wherein the noble metal is incorporated into the calcined mixture by a method selected from the group consisting of ion exchange, impregnation and physical admixture.

11.The process as claimed in claim 1, wherein the binder material is selected from the group consisting of clay, silica, alumina, metal oxide, and mixtures thereof.

12.A dispersed noble metal-containing catalyst prepared by a process as claimed in claim 1.

13.The dispersed noble metal-containing catalyst as claimed in claim 12 is used for hydroisomerization of long chain n-paraffins ranging from C12-C40 wherein surface acidity is undesirable. ,TagSPECI:As Attached