Patent ID: 7846868
Filing Date: 2010-12-07
Classification: B01J,F01N,Y02T,Y10T

Abstract:
1. A honeycomb-shaped straight-flow structure for a catalyst, comprising: a plurality of cellular walls a plurality of cellular passages demarcated by the cellular walls, said cellular passages having inlets and outlets, wherein said inlets and outlets of each cellular passage are open-ended, and wherein a plurality of pores exhibiting unequal pore volumes are defined in portions of the cellular walls having a first side demarcating one of the cellular passages and a second side opposite the first side and demarcating another of the cellular passages, the pore volumes being greater on an exhaust-gas-flow upstream side of the honeycomb-shaped straight-flow structure than on an exhaust-gas-flow downstream side thereof; and a coating layer coating a surface of the cellular walls and the pores of the honeycomb-shaped straight-flow structure, wherein the coating layer has a thickness on the exhaust-gas-flow upstream side of the honeycomb-shaped straight-flow structure greater than a thickness on the exhaust-gas-flow downstream side thereof.