| 摘要 |
The invention relates to a two-layer, three-way catalyst composed of a catalytic coating applied directly to an inert woven body and a catalytically active coating lying thereon. Said catalyst is particularly suited for cleaning exhaust gases from vehicles which have gas-fueled internal combustion engines. Both layers of the catalyst contain an active aluminum oxide and a cerium/zirconium mixed oxide, both of which are catalytically activated by palladium. The second, gas-side layer, contains both palladium and rhodium which, in addition to the palladium, is applied to the active aluminum oxide and to the cerium/zirconium mixed oxide of the second layer. The cerium/zirconium mixed oxide of the second layer comprises a higher zirconium oxide content than the cerium/zirconium mixed oxide of the first layer. The catalyst is characterized by extraordinary activity along with excellent aging stability. |
