Compositions – Preservative agents – Anti-oxidants or chemical change inhibitants
Patent
1978-06-08
1979-05-01
Shine, W. J.
Compositions
Preservative agents
Anti-oxidants or chemical change inhibitants
4232135, B01J 2104, B01J 2342, B01J 2344
Patent
active
041523016
ABSTRACT:
A layered catalyst having significantly improved performance characteristics including greater resistance to poisoning and sintering in automotive exhaust comprising an alumina support having a first layer of platinum positioned at the support surface and penetrating the body thereof to a desired depth with a second layer of at least one of the catalytically active materials selected from the group consisting of rhodium and palladium, the second layer being adjacent to the first layer and penetrating the body of the support for a depth beyond that of the first layer, maximum concentration of platinum being in the first layer together with minimum concentration of the catalytically active materials, and minimum concentration of platinum with maximum concentration of the catalytically active materials being in the second layer. The catalyst is prepared by impregnation with separate solutions of the catalyst materials, acid treatment of the active sites of the support being used to block the sites from the surface through the desired depth of the platinum layer.
REFERENCES:
patent: 3259589 (1966-07-01), Michalko
patent: 3360330 (1967-12-01), Hoekstra
Hegedus Louis
Summers Jack C.
Carter Sidney
General Motors Corporation
Shine W. J.
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