| 主权项 |
1. A catalytic convertor comprising a substrate comprising a substrate monolith coated with a catalyst composition comprising a mixed metal catalyst supported on a support, wherein the mixed metal catalyst comprises unalloyed palladium and palladium-gold alloy disposed on the support, and at least one promoter, wherein the palladium-gold alloy is enriched in gold, the at least one promoter comprises at least one reducible metal oxide, wherein the at least one reducible metal oxide is at least one oxide of manganese, iron, tin, copper, cobalt, titanium and cerium, and wherein the support is particulate ceria or a mixed oxide or composite oxide of particulate ceria with alumina. |
