Patent ID: 8039415
Filing Date: 2011-10-18
Classification: B01D,B01J,C04B,F01N,Y02T,Y10S,Y10T

Abstract:
1. A pillar-shaped honeycomb structure comprising: a plurality of cells placed in parallel with one another in a longitudinal direction with a cell wall therebetween; a plug sealing either one of end portions of each of said plurality of cells; and a catalyst being supported on said cell wall, wherein said plurality of cells are composed of large-volume cells and small-volume cells, said large-volume cell has a larger cross-sectional area perpendicular to a longitudinal direction thereof than a cross-sectional area perpendicular to the longitudinal direction of said small-volume cell, said large-volume cell is sealed at one end portion of said honeycomb structure, while the small-volume cell is sealed at the other end portion of said honeycomb structure, said large-volume cells are defined by first cell wall parts of said cell wall that extend halfway from a respective large-volume cell to respective adjacent cells, said first cell wall parts extending around a perimeter of said respective large-volume cell, said small-volume cells are defined by second cell wall parts of said cell wall that extend halfway from a respective small-volume cell to respective adjacent cells, said second cell wall arts extending around a perimeter of said respective small-volume cell, said catalyst is supported uniformly about an entire perimeter of said large-volume cells, an amount of said catalyst supported on the first cell wall parts forming said large-volume cells is about 2 to about 10 times larger per unit volume than an amount of said catalyst supported on the second cell wall parts forming said small-volume cells, said catalyst is an oxide catalyst that includes an oxide and/or is capable of oxidizing a compound, and the amount of said catalyst is about 5 to about 60 g/l with respect to an apparent volume of said honeycomb structure.