Patent ID: 8591820

Claim:
A particulate filter comprising: a honeycomb body comprising an inlet end and an outlet end with a plurality of channel walls extending from the inlet end to the outlet end, the plurality of channel walls defining channels that direct a flow of fluid from the inlet end to the outlet end, wherein at least a first set of the channels are plugged proximate at least one of the inlet end or the outlet end; a filter zone extending from the inlet end of the honeycomb body in an axial direction of the honeycomb body, wherein an axial length l fz of the filter zone is less than an axial length L of the honeycomb body; and a DeNO x zone downstream of the filter zone and extending in an axial direction towards the outlet end of the honeycomb body, wherein the plurality of channel walls of the honeycomb body comprise a DeNO x functional catalyst in the DeNO x zone and a ratio of a permeability κ fz of the channel walls in the filter zone to a permeability κ Dz of the channel walls in the DeNO x zone (κ fz :κ Dz ) is at least 5.