Patent ID: 9540977
Date: 2017-01-10
CPC Classifications: B01D,C04B,F01N,Y02T

Claim:
1. A particulate filter having a columnar ceramic honeycomb structure comprising a plurality of first flow channels and a plurality of second flow channels, wherein the plurality of first flow channels extend in an axial direction of the ceramic honeycomb structure, are each opened in one end face, and are each closed in the other end face; the plurality of second flow channels extend in the axial direction of the ceramic honeycomb structure, are each opened in the other end face, and are each closed in the one end face; adjacently to each of the first flow channels, the second flow channel and the other first flow channel, are arranged so as to sandwich a partition wall portion forming each of the first flow channels; a sum total of areas of inner faces of the plurality of first flow channels in the total volume of the ceramic honeycomb structure is 1.5 to 2.5 m a number density of a total of the plurality of first flow channels and the plurality of second flow channels is 150 to 350 per unit square inch in a cross section perpendicular to an axis of the ceramic honeycomb structure; a hydraulic diameter of each of the plurality of first flow channels is 0.5 to 1.0 mm; wherein the inner face of at least one of the first flow channels has a plurality of salients extending in the axial direction of the ceramic honeycomb structure; and wherein in at least one of the first flow channels, an average height of salients provided on a partition wall portion separating the first flow channel and the second flow channel from each other is larger than an average height of salients provided on a partition wall portion separating the first flow channel and the first flow channel from each other.