Patent ID: 8246710
Filing Date: 2012-08-21
Classification: B01D,F01N,Y02T,Y10T

Abstract:
1. A honeycomb structural body comprising: a columnar porous ceramic block comprising a plurality of columnar porous ceramic members combined through sealing material layers into the porous ceramic block, each of the columnar porous ceramic members having a plurality of through holes extending in parallel with one another in a length direction of the porous ceramic block with a partition wall portion interposed between the through holes, wherein the plurality of through holes includes a group of large-capacity through holes sealed at one end of the columnar porous ceramic block and a group of small-capacity through holes sealed at the other end of the columnar porous ceramic block, each of the large-capacity through holes has an octagonal shape in a cross section perpendicular to the length direction of the columnar porous ceramic block, each of the small-capacity through holes has a quadrangle shape in a cross section perpendicular to the length direction of the columnar porous ceramic block, the large-capacity through holes and the small-capacity through holes are positioned such that the partition wall portion has a wall thickness which is substantially uniform between the through holes, the partition wall portion has a porosity of 20% to 80%, the columnar porous ceramic block is configured to filter a gas from the group of large-capacity through holes, through the partition wall portion and into the group of small-capacity through holes, and the partition wall portion has a surface roughness R