| 摘要 |
An oxidation catalyst for treating an exhaust gas from a diesel engine and an exhaust system comprising: a first washcoat region 1 for oxidising carbon monoxide (CO) and hydrocarbons (HCs), wherein the first washcoat region comprises a first platinum group metal (PGM) and a first support material; a second washcoat region 2 for oxidising nitric oxide (NO), wherein the second washcoat region comprises platinum (Pt), manganese (Mn) and a second support material; and a substrate 3 having an inlet end and an outlet end; wherein the second washcoat region is a second washcoat zone disposed at an outlet end of the substrate and after contact of the exhaust gas with the first washcoat region. The first washcoat zone and the second washcoat zone may be deposited on the substrate as a single layer. The first platinum group metal may be selected from the group consisting of platinum, palladium and a combination thereof. The second washcoat zone may comprise platinum as the only platinum group metal. The first and second support materials may comprise a refractory metal oxide selected from the group consisting of alumina, silica, titanium, zirconia, ceria and a mixed or composite oxide of two or more thereof. An exhaust system, vehicle or apparatus, and method of use comprising the catalyst are also disclosed. |
