Patent ID: 8105544
Filing Date: 2012-01-31
Classification: B01D,B01J,C04B,F01N

Abstract:
1. An exhaust gas treating apparatus comprising: a plurality of honeycomb structures comprising an upstream honeycomb structure and a downstream honeycomb structure each provided along an exhaust gas flowing direction of the exhaust gas treating apparatus, each of the plurality of honeycomb structures comprising at least one honeycomb unit, the at least one honeycomb unit having a longitudinal direction and comprising: a first ratio of weight of the zeolite ion-exchanged with at least one of Cu, Mn, Ag, and V to a total weight of the zeolite ion-exchanged with at least one of Cu, Mn, Ag, and V and the zeolite ion-exchanged with at least one of Fe, Ti, and Co, the first ratio in the downstream honeycomb structure being greater than the first ratio in the upstream honeycomb structure; and a second ratio of weight of the zeolite ion-exchanged with at least one of Fe, Ti, and Co to the total weight of the zeolite ion-exchanged with at least one of Cu, Mn, Ag, and V and the zeolite ion-exchanged with at least one of Fe, Ti, and Co, the second ratio in the upstream honeycomb structure being greater than the second ratio in the downstream honeycomb structure.