Patent ID: 8663587
Filing Date: 2014-03-04
Classification: B01D,F01N,Y02T

Abstract:
1. A catalytic article comprising: a wall flow filter having an inlet end, an outlet end, alternating inlet channels and outlet channels and porous walls separating the inlet channels from the outlet channels, the inlet channels having plugs at the outlet end and the outlet channels having plugs at the inlet end, the porous walls having a mean pore diameter and a pore size distribution; a first ammonia SCR catalyst material embedded in the porous walls at a first loading, the first SCR catalyst material having a first mean particle size and first particle size distribution; and a second ammonia SCR catalyst material on the surface of the porous walls at a second loading, the second SCR catalyst material having second mean particle size and second particle size distribution, wherein both the first and second SCR catalyst material contain no added platinum group metal component; wherein the second mean particle size is larger than the first mean particle size.