Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
197 words
A process of preparing a catalyst for reforming a methanol to hydrogen and carbon monoxide, the process comprising the steps of: (a) depositing at least one metal oxide which is an oxide of a metal selected from the group consisting of Ce, La, Pr, Nd and Y on a carrier which comprises active alumina over at least substantially the entire surface thereof; (b) impregnating the carrier treated at step (a) with an aqueous solution comprising ammonium thiosulfate and at least one thermally decomposable compound of a catalytic metal of the platinum group; (c) after step (b), drying the carrier so as to reduce moisture content therein to a predetermined level; (d) baking the carrier impregnated with said solution in a steam atmosphere at a temperature between about 500° C. and about 600° C. to decompose said thermally decomposable compound adhering to the carrier to thereby deposit at least one catalytic metal of the platinum group on the carrier; and (e) subjecting the carrier treated at step (d) to a reduction treatment which comprises immersing the carrier in a solution of a reducing agent, such that said catalytic metal deposited on the carrier is rendered substantially completely reduced.
Claim 2
Dependent Claim
197 words
A process of preparing a catalyst for reforming a methanol to hydrogen and carbon monoxide, the process comprising the steps of: (a) depositing at least one metal oxide which is an oxide of a metal selected from the group consisting of Ce, La, Pr, Nd and Y on a carrier which comprises active alumina over at least substantially the entire surface thereof; (b) impregnating the carrier treated at step (a) with an aqueous solution comprising ammonium thiosulfate and at least one thermally decomposable compound of a catalytic metal of the platinum group; (c) after step (b), drying the carrier so as to reduce moisture content therein to a predetermined level; (d) baking the carrier impregnated with said solution in a steam atmosphere at a temperature between about 500° C. and about 600° C. to decompose said thermally decomposable compound adhering to the carrier to thereby deposit at least one catalytic metal of the platinum group on the carrier; and (e) subjecting the carrier treated at step (d) to a reduction treatment which comprises immersing the carrier in a solution of a reducing agent, such that said catalytic metal deposited on the carrier is rendered substantially completely reduced.
Claim 3
Dependent Claim
30 words
A process according to claim 1, wherein the concentration of said reducing agent in said solution for the treatment at the step (e) is not higher than 5% by weight.
Claim 4
Dependent Claim
40 words
A process according to claim 1 wherein said reducing agent is sodium boron hydride, the concentration of said reducing agent in said solution for the treatment at the step (e) is in the range from 0.01 to 5% by weight.
Claim 5
Dependent Claim
38 words
A process according to claim 1, wherein said reducing agent is hydrazine, the concentration of said reducing agent in said solution for the treatment at the step (e) is in the range from 0.1 to 5% by weight.
Claim 6
Dependent Claim
59 words
A process according to claim 1, wherein step (a) is performed such that the total amount of the metal of said metal oxide comprises 0.1 to 10% by weight of the carrier and the step (b) is performed such that the total content of said at least one catalytic metal in the catalyst becomes 0.1 to 1.0% by weight.
Claim 7
Dependent Claim
30 words
A process according to claim 5, wherein the catalytic metal of said thermally decomposable compound in the step (b) is selected from the group consisting of Pt, Rh and Pd.
Claim 8
Dependent Claim
29 words
A process according to claim 6, wherein said thermally decomposable compound in the step (b) is selected from the group consisting of chloroplatinic acid, rhodium trichloride and palladium dichloride.
Claim 9
Dependent Claim
68 words
A process according to claim 5, wherein step (a) comprises the sub-steps of (i) impregnating the carrier with an aqueous solution of at least one salt of a metal selected from the group consisting of the Ce, La, Pr, Nd and Y, and (ii) baking the carrier impregnated with said solution in sub-step (i) to decompose said salt adhering to the carrier to thereby form said metal oxide.
Claim 10
Dependent Claim
19 words
A process according to claim 8, wherein said salt is selected from the group consisting of nitrate and sulfate.
Claim 11
Dependent Claim
11 words
A process according to claim 1, wherein said carrier is granular.
Claim 12
Dependent Claim
11 words
A process according to claim 1, wherein said carrier is monolithic.