Patent ID: 9156742
Filing Date: 2015-10-13
Classification: B01D,B01J,C04B,F01N,Y10T

Abstract:
1. A honeycomb structural body formed as a monolithic mold comprising partition walls arranged in a lattice shape and a plurality of cells surrounded by the partition walls, wherein the honeycomb structural body comprises a plurality of cell density sections having a different cell density formed in a radial direction from a central side to an outer peripheral side, a boundary section is formed between the cell density sections which are immediately adjacent, the boundary section comprises boundary partition walls and a plurality of boundary cells having a polygonal shape, the boundary partition walls connect the partition walls in the cell density sections formed adjacent to the boundary section, the boundary cells having a polygonal shape are different in shape from the cells, at least a part of the boundary cell is surrounded by the boundary partition walls, and the honeycomb structural body satisfies a relationship of where φ1 indicates an average hydraulic diameter of the boundary cells formed in the boundary section, and φ2 indicates an average hydraulic diameter of the cells formed in the cell density section formed directly inside of the boundary section.