| 摘要 |
An oxidation catalyst for treating an exhaust gas from a compression ignition engine comprises: a substrate; a 1st washcoat region comprising palladium and a 1st support material comprising cerium oxide; and a 2nd washcoat region comprising platinum and a 2nd support material. The 2nd support material may comprise a refractory metal oxide, which may be selected from a group consisting of alumina, silica, titania, zirconia, ceria, and mixed or composite oxides thereof. The 1st washcoat region may comprise an amount of palladium of less than 2% by weight. The 2nd washcoat region may be disclosed or supported on the substrate downstream of the 1st washcoat region. Alternatively we 1st washcoat region may be a lair disclosed or supported on the 2nd washcoat region. An exhaust system, vehicle comprising a compression ignition engine, method of modulating the content of NOx and use of the oxidation catalysts are also disclosed. |
