High temperature stable catalyst composition and method for its preparation
AssigneeEngelhard Minerals & Chemicals Corporation
InventorsSaul G. Hindin, George R. Pond
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Abstract
Catalysts having good high temperature stability which are particularly used for selected high temperature reactions are disclosed as are methods for their preparation and use. The catalytically-active materials include platinum group metal deposited on a catalyst slip or composite which contains a mixture of alumina, a rare earth metal oxide, and a mixture of metallic oxides of selected IIA and IVA metals and selected VIB metals. The slips or carrier compositions are calcined at a temperature of at least 500.degree. C. before deposition of platinum group metal and characterized by having a surface area of at least 20 m.sup.2 /g after calcination at a temperature of 1200.degree. C. for 2 hours.
Claims21
A catalyst composition consisting essentially of (a) a catalytically-active calcined composite of alumina, a rare earth metal oxide and a mixture of two metal oxide components wherein the first metal oxide component is selected from the group consisting of an oxide of chromium, tungsten and mixtures thereof and the second oxide component is selected from the group consisting of an oxide of calcium, strontium, barium, silicon, tin and mixtures thereof, said composite having been formed by calcination at a temperature of at least 500.degree. C. and being characterized by a surface area of at least 20 m.sup.2 /g when heated for 2 hours at 1200.degree. C.;
- and (b) a catalytically-effective amount of a platinum group metal incorporated in said calcined composite after calcination of said composite at a temperature of at least 500.degree. C.
A catalyst composition consisting essentially of (a) an inert support and deposited on said support (b) a catalytically-active calcined composite consisting essentially of alumina, a rare earth metal oxide and a mixture of two metal oxide components wherein the first oxide component is selected from the group consisting of an oxide of chromium, tungsten and mixtures thereof and the second oxide component is selected from the group consisting of an oxide of calcium, barium, strontium, silicon, tin and mixtures thereof, said composite having been formed by calcination at a temperature of at least 500.degree. C. before being deposited on said support and being characterized by a surface area of at least 20 m.sup.2 /g when heated for 2 hours at 1200.degree. C. and (c) a catalytically-effective amount of a platinum group metal incorporated in said composite after said composite has been calcined at a temperature of at least 500.degree. C. and after said composite has been deposited on said inert support.
A method for the preparation of a catalyst composition comprising (a) forming an aqueous slurry or solution containing, either dispersed or dissolved therein, an alumina-producing aluminum compound, a rare earth metal compound which upon calcining yields the corresponding rare earth metal oxide, and a mixture of two metal compound components which upon calcining yield the corresponding metal oxides wherein the first of said metal compound components is selected from the group consisting of a compound of chromium, tungsten, and mixtures thereof and the second of said metal compound components is selected from the group consisting of a compound of calcium, strontium, barium, silicon, tin, and mixtures thereof;
- (b) recovering from said slurry or solution an intimate admixture of solids comprising said alumina-producing aluminum compound, said rare earth metal compound, and said first and second metal compound components;
- (c) calcining said intimate admixture at a temperature of at least 500.degree. C. to form a catalytically-active composite containing alumina, said rare earth metal oxide, and said metal oxides corresponding to said first and second metal compound components, said composite so formed being characterized by a surface area of at least 20 m.sup.2 /g after heating for 2 hours at 1200.degree. C.;
- and (d) adding to said calcined admixture an amount of a dispersion or solution of a platinum group metal or compound sufficient to obtain, upon drying or calcining, said catalyst composition containing a catalytically-effective amount of said platinum group metal.
Dependencies are inferred from the claim text.