THREE-WAY CATALYST
A description is given of a double-layered three-way catalyst for cleaning the exhaust gases of internal combustion engines, with outstanding activity and temperature stability. The catalyst contains, in the first layer, applied to a catalyst support, active aluminium oxide and a first cerium/zirconium mixed oxide, both of which are catalytically activated by palladium. In the second layer, which is directly in contact with the exhaust gas, it likewise contains an active aluminium oxide and a second cerium/zirconium mixed oxide, both of which are catalytically activated by rhodium. The second cerium/zirconium mixed oxide has a higher zirconium-oxide content than the first mixed oxide.