| 摘要 |
Nitrogen oxide storage catalyst, comprising at least two catalytically active washcoat layers on a supporting body, where a lower washcoat layer (A) contains cerium oxide, an alkaline earth compound and/or an alkaline compound and platinum, and an upper washcoat layer (B), which is arranged on top of washcoat (A), contains cerium oxide, platinum and/or palladium and no alkaline earth compound. The layer (B) is present in an amount of 50-200 g/l, and the minimum mass fraction in percentage of cerium oxide in the layer (B) is calculated by 0.1x amount of the washcoat layer (B) in g/l+30. An independent claim is included for converting nitrogen oxide (NO x) in the exhaust gases of motor vehicles operated using lean-burn engines, comprising passing the exhaust gas through a nitrogen oxide storage catalyst on a supporting body. |
