| 摘要 |
<p>A catalytic article for catalysing the oxidation of hydrocarbons and carbon monoxide and the reduction of nitrogen oxides comprises an upstream section that comprises an upstream substrate and a downstream section that comprises a downstream substrate. A first layer on the downstream substrate comprises at least one first palladium component, a first oxygen-storage component in intimate contact with the palladium component and, optionally, one or more components selected from a first zirconium component, a first alkaline earth metal component, a lanthanum metal component and a neodymium metal component. A second layer on the upstream substrate comprises at least one second palladium component and, optionally, at least one component selected from a second zirconium component, a second alkaline earth metal component, a second lanthanum metal component and a second neodymium metal component. The upstream section and downstream section may be parts of a single substrate or may comprise separate substrates. Suitable substrates are honeycomb substrates.</p> |
