I/We Claim:
1) A hydrodesulfurization catalyst comprising:
(a) a first metal oxide having weight percentage in the range of 4 - 9 % with respect to the total weight of the catalyst;
(b) a second metal oxide having weight percentage in the range of 15 - 26 % with respect to the total weight of the catalyst;
(c) a third metal oxide having weight percentage in the range of 4 - 7 % with respect to the total weight of the catalyst;
(d) at least one porous support having weight percentage in the range of 40 - 65 % with respect to the total weight of the catalyst; and
(e) at least one chelating agent having weight percentage in the range of 1 - 7 % with respect to the catalyst,
wherein the hydrodesulfurization catalyst has a BET surface area in the range of 155to210m2/g.
2) The hydrodesulfurization catalyst as claimed in claim 1, wherein the first metal oxide is phosphorus oxide; the second metal oxide is selected from the group consisting molybdenum oxide, tungsten oxide, and combinations thereof; and the third metal oxide is selected from the group consisting of cobalt oxide, nickel oxide, and combinations thereof.
3) A hydrodesulfurization (HDS) catalyst comprising:

(a) phosphorus oxide having weight percentage in the range of 4 - 9 % with respect to the total weight of the catalyst;
(b) molybdenum oxide having weight percentage in the range of 15 - 26 % with respect to the total weight of the catalyst;
(c) nickel oxide having weight percentage in the range of 4 - 7 % with respect to the total weight of the catalyst;
(d) at least one porous support having weight percentage in the range of 40 - 65 % with respect to the total weight of the catalyst; and
(e) at least one chelating agent having weight percentage in the range of 1 - 7 % with respect to the catalyst,
wherein the hydrodesulfurization catalyst has a BET surface area in the range of 155to210m2/g.

4) The hydrodesulfurization catalyst as claimed in any one of the claim 1 or 3, wherein the catalyst has a surface acidity in the range of 0.3 to 0.5 mmol/g.
5) The hydrodesulfurization catalyst as claimed in any one of the claim 1 or 3, wherein the catalyst has a total pore volume in the range of 0.3 to 0.45 cm3/g, and an average pore size in the range of 6 to 12 nm.
6) The hydrodesulfurization catalyst as claimed in any one of the claim 1 or 3, wherein at least one porous support is selected from AI2O3 Ti02, SiC>2, SiCh-AhCte, or zeolite-Y.
7) The hydrodesulfurization catalyst as claimed in any one of claim 1 or 3, wherein the at least one chelating agent is selected from citric acid, glutamic acid, nitriloacetic acid, glutaric acid, or succinic acid.
8) The hydrodesulfurization catalyst as claimed in claim 7, wherein the at least one chelating agent is a combination citric acid and glutamic acid.
9) A process of preparing the catalyst as claimed in claim 3, the process comprising:

(a) impregnating a phosphorus oxide precursor on at least one porous support, followed by drying and calcination to obtain a first precursor;
(b) dispersing a molybdenum oxide precursor on the first precursor in presence of at least one chelating agents, followed by ageing, drying, and calcination to obtain a second precursor; and
(c) impregnating a nickel oxide precursor on the second precursor in the presence of at least one chelating agent, followed by drying to obtain the catalyst.

10) The process as claimed in claim 9, wherein the phosphorus oxide precursor is selected from the group consisting of orthophosphoric acid, diammonium hydrogen phosphate, ammonium dihydrogen phosphate, hypophosphorous acid, and combinations thereof; the molybdenum oxide precursor is selected from the group consisting of ammonium heptamolybdate, molybdophosphic acid, molybdenum oxide, molybdenum chloride, and combinations thereof; the nickel oxide precursor is selected from the group consisting of nickel acetate, nickel nitrate, nickel acetylacetonate, nickel chloride, and combinations thereof.
11) The process as claimed in claim 9, wherein impregnating the phosphorus oxide precursor on at least one porous support is carried out by spray impregnation at a pH in the range of 2-5.5.
12) The process as claimed in claim 9, wherein the drying and calcination of step (a) is carried out at a temperature in the range of 400 - 500 °C.

13) The process as claimed in claim 9, wherein dispersing the molybdenum oxide precursor on the first metal precursor in presence of at least two chelating agents is carried out at a pH in the range of 2 - 5.5.
14) The process as claimed in claim 9, wherein the ageing of step (b) is carried out at a temperature in the range of 25 - 35 °C for a period in the range of 2 - 5 hours; the drying of step (b) is carried out at a temperature in the range of 80-100 °C; the calcination of step (b) is carried out at a temperature in the range of 450 - 600 °C.
15) The process as claimed in claim 9, wherein impregnating the nickel oxide precursor on the second precursor in the presence of at least one chelating agent is carried out by spray impregnation at a pH in the range of 4.5 - 5.5.
16) The process as claimed in claim 9, wherein the drying of step (c) is carried out at a temperature in the range of 80-100 °C for a period in the range of 5 - 8 hours.
17) A method of hydrodesulfurizing a hydrocarbon feedstock, the method comprising: contacting the hydrocarbon feedstock comprising at least one sulfur-containing hydrocarbon compound with the hydrodesulfurization catalyst as claimed in any one of the claim 1-8, in the presence of hydrogen gas to hydro-desulfurize the at least one sulfur-containing hydrocarbon compound to form hydrogen sulfide and a hydro-desulfurized hydrocarbon compound,
wherein the hydrocarbon feedstock is contacted with the hydrodesulfurization catalyst at a temperature in the range of 200 to 500° C.
18) The method as claimed in claim 17, wherein the pressure of the hydrogen gas is in the
range of 2 to lOMPa.
19) The method as claimed in claim 17, wherein the hydrocarbon feedstock to the
hydrodesulfurization catalyst as claimed in any one of the claim 1-8, weight percentage
ratio is in the range of 500 g - 3000 g : 1000 g.