High performance thermally stable catalyst
AssigneeEngelhard Corporation
InventorJoseph C. Dettling
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Abstract
A catalyst composition includes a carrier on which is disposed a catalytic material which may optionally be provided in discrete first and second coats. The catalyst material contains, e.g., in the first coat, a refractory inorganic oxide first support having a catalytically effective amount of platinum dispersed thereon. The catalyst material also contains, e.g., in the second coat, a stabilized alumina second support having a catalytically effective amount of a second platinum catalyst dispersed thereon, and a third catalyst component which contains a zirconia-stabilized third support, e.g., alumina, having dispersed thereon catalytically effective amounts of rhodium and palladium. A method of treating internal combustion engine exhaust gases with the catalyst composition is also disclosed.
Claims17
A catalyst composition comprising a carrier on which is disposed a catalytic material comprising:
- (a) a first support comprising stabilized alumina, (b) a catalytically effective amount of a first platinum catalytic component dispersed on the first support, (c) a second support consisting essentially of a are earth metal oxide, (d) a catalytically effective amount of both a rhodium catalytic component and a palladium catalytic component dispersed on the second support, the rhodium and palladium catalytic components being present in quantities to provide in the catalytic material a rhodium to palladium weight ratio of from about 50:1 to 1:50, measured as metals.
A catalyst composition comprising a carrier on which is disposed a catalytic material comprising a catalytically effective amount of a first platinum catalytic component dispersed on a first support material comprising stabilized alumina and a catalytically effective amount of both a rhodium catalytic component and palladium catalytic component dispersed entirely on a substantially alumina-free second support material comprising a rare earth metal oxide, the rhodium and palladium catalytic components being present in quantities to provide in the catalytic material a rhodium to palladium weight ratio of from about 50:1 to 1:50, measured as the metals.
Dependencies are inferred from the claim text.