| abstract |
The present invention relates to a catalyst which comprises a carrier substrate of length L, which extends between a first end face a and a second end face b, and differently composed catalytically active material zones A, B and C, wherein Material zone A comprises palladium or palladium and platinum with a weight ratio of Pd: Pt> 1, and also cerium oxide, - Material zone B includes platinum or platinum and palladium with a weight ratio of Pt: Pd> 1, as well as cerium oxide and / or cerium / zirconium mixed oxide and - Material zone C includes platinum or platinum and palladium with a weight ratio of Pt: Pd> 1, and a carrier oxide and in which - Material zone B is arranged above material zone A and - Material zone C is arranged over material zone B and extends from the second end face b of the carrier substrate over a length of 20 to 60% of the length L. and a catalyst arrangement containing the same. |