Patent ID: 8802016
Filing Date: 2014-08-12
Classification: B01D,B01J,F01N

Abstract:
1. A catalyzed soot filter, comprising a wall flow substrate comprising an inlet end, an outlet end, a substrate axial length extending between the inlet end and the outlet end, and a plurality of passages defined by internal walls of the wall flow substrate; wherein the plurality of passages comprise inlet passages having an open inlet end and a closed outlet end, and outlet passages having a closed inlet end and an open outlet end; wherein the internal walls of the inlet passages comprise a first inlet coating that extends from the inlet end to a first inlet coating end, thereby defining a first inlet coating length, wherein the first inlet coating length is x % of the substrate axial length with 0<x<100; wherein the internal walls of the outlet passages comprise a first outlet coating that extends from the outlet end to a first outlet coating end, thereby defining a first outlet coating length, wherein the first outlet coating length is 100-x % of the substrate axial length; wherein the first inlet coating length defines an upstream zone and the first outlet coating length defines a downstream zone; wherein the first inlet coating and the first outlet coating are present on the wall flow substrate at a coating loading ratio in the range from 0.20 to 0.40, calculated as ratio of the loading of the first inlet coating (g/inch