Patent ID: 8845974
Filing Date: 2014-09-30
Classification: B01D,B01J,C04B,F01N

Abstract:
1. A catalyzed soot filter comprising: a wall flow monolith having a plurality of longitudinally extending passages formed by longitudinally extending porous 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; a first washcoat permeating the walls of the wall flow monolith; and a second washcoat disposed on the walls of the passages of the wall flow monolith, wherein the first washcoat comprises one of (1) platinum and palladium on refractory metal oxide support particles or (2) zeolite and alumina; and the second washcoat comprises the other of (1) platinum and palladium on refractory metal oxide support particles or (2) zeolite and alumina.