B - Operations – Transporting – 01 – J
Patent
B - Operations, Transporting
01
J
252/50, 252/89
B01J 21/04 (2006.01) B01D 53/94 (2006.01) B01J 23/40 (2006.01) B01J 23/42 (2006.01) B01J 23/44 (2006.01) B01J 37/02 (2006.01)
Patent
CA 1098105
C-2830 D-1442 CATALYST FOR AUTOMOTIVE EMISSION CONTROL AND METHOD FOR MAKING SAME Abstract of the Disclosure 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 con- sisting 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 ma- terials, 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 treat- ment of the active sites of the support being used to block the sites from the surface through the desired depth of the platinum layer.
300083
Hegedus Louis
Summers Jack C.
General Motors Corporation
Gowling Lafleur Henderson Llp
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