| 摘要 |
An exhaust gas aftertreatment system for a diesel engine vehicle, which system comprising a NOx Storage Catalyst (NSC) followed in a downstream direction by a Catalysed Soot Filter-(CSF), wherein the CSF comprises an oxidative catalyst comprising a palladium-rich weight ratio of platinum and palladium. Preferably the Pt:Pd ratio is less than 1:2 or 1:10 and the oxidative catalyst comprises ceria or ceria-zirconia mixed oxide with an oxygen storage component in an amount 20-50% weight. The CSF may comprise a wall flow filter with inlet and outlet channels, where the inlet channels comprise a platinum based oxidative catalyst and the outlet channels comprise the palladium rich Pt:Pd oxidative catalyst. A method of treating exhaust gas, including a regenerating event, is also claimed.
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