초록 ▼

An emission treatment system including a catalyzed soot filter comprising a wall flow monolith and a catalyst comprising at least two types of support particles is described. The first support particle contains at least a platinum component, the second support particles contains at least a palladium

An emission treatment system including a catalyzed soot filter comprising a wall flow monolith and a catalyst comprising at least two types of support particles is described. The first support particle contains at least a platinum component, the second support particles contains at least a palladium component. The wall flow monolith may be washcoated with a slurry comprising at least two types of particles without applying a passivation layer to the wall flow monolith.

대표청구항 ▼

What is claimed is: 1. A catalyzed soot filter comprising:a wall flow monolith having a plurality of longitudinally extending passages formed by longitudinally extending walls bounding and defining said passages, the passages comprising inlet passages having an open inlet end and closed outlet end,

What is claimed is: 1. A catalyzed soot filter comprising:a wall flow monolith having a plurality of longitudinally extending passages formed by longitudinally extending walls bounding and defining said passages, the passages comprising inlet passages having an open inlet end and closed outlet end, and outlet passages having a closed inlet end and an open outlet end; anda washcoat disposed on the walls of the wall flow monolith, the washcoat including first support particles and second support particles, a precious metal component comprising a mixture of platinum and palladium on the first support particles, and a precious metal component selected from substantially only palladium on the second support particles.