Compositions and methods for high temperature stable catalysts
AssigneeEngelhard Minerals & Chemicals Corporation
InventorsSaul G. Hindin, Joseph C. Dettling
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Abstract
Catalysts having good high temperature stability which are particularly useful 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 catalytic slip or composite which contains a mixture of alumina and a mixture of IVB and selected VIB metal oxides. The slips or carrier compositions are calcined at a temperature of at least 850.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 two hours.
Claims20
A catalyst composition characterized by a surface area of at least 20 m.sup.2 /g after calcination for two hours at 1200.degree. C. consisting essentially of (a) a catalytically-active, calcined composite consisting essentially of alumina, and a mixture of two metal components wherein the first component is selected from the group consisting of an oxide of chromium, tungsten, and mixtures thereof and the second component is selected from the group consisting of an oxide of a Group IVB metal, and mixtures thereof, and (b) a catalytically-effective amount of platinum group metal added thereto after calcination of said composite at a temperature of at least 850.degree. C.
A catalyst composition consisting essentially of (a) an inert support, (b) a catalytically-active calcined composite deposited on said support, said composite consisting essentially of alumina, and a mixture of two metal oxide components wherein the first component is selected from the group consisting of an oxide of chromium, tungsten, and mixtures thereof and the second component is selected from the group consisting of an oxide of a Group IVB metal, and mixtures thereof, said composite having been calcined at a temperature of at least 850.degree. C before deposition on said support and characterized by a surface area of at least 20 m.sup.2 /g after calcination for two hours at 1200.degree. C. and (c) a catalytically-effective amount of a platinum group metal incorporated in said composite.
A method for the preparation of a catalyst composition including the steps of (a) forming an intimate admixture consisting essentially of an alumina-producing aluminum compound and a mixture of two metal compound components which upon calcining yield the corresponding oxide 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 compounds components is selected from the group consisting of a compound of a Group IVB metal and mixtures thereof, (b) calcining said intimate admixture at a temperature of at least 850.degree. C to form a catalytically-active composite thereof characterized by a surface area of at least 20 m.sup.2 /g after calcination for two hours at 1200.degree. C, and (c) incorporating a catalytically-effective amount of a platinum group metal with said calcined admixture.
Dependencies are inferred from the claim text.