| abstract |
The present invention is a catalyst article comprising a multilayer catalyst composition comprising a substrate underlying a multilayer catalyst composition and a first layer and a second layer, the first layer being a substrate and a second layer. Wherein the first layer comprises a first porous refractory oxide material impregnated with at least one base metal component, and the second layer comprises at least one platinum group metal Provided is a catalytic article comprising a second porous refractory oxide material impregnated with a component. The second porous refractory oxide material is a porous refractory oxide material other than alumina, or the catalyst composition further comprises an intermediate layer between the first layer and the second layer, the intermediate layer Is a refractory oxide material other than alumina. Also provided are methods of making and using catalyst articles, and emissions treatment systems that include catalyst articles. |