FILTER AND FILTER AGGREGATE

摘要

A honeycomb filter 10 has a plurality of through holes 12, and in the wall part 15 between the through holes 12 is formed a coated layer with a catalyst supported thereon. The filter 10 satisfies the expression 2.5 × A/B + 52.5 ‰¤ C ‰¤ 2.5 × A/B + 60.2 (A ‰¤ 20, 0 < B ‰¤ 20), where A(%) represents the ratio of pores with a pore diameter of 10µm or less to the total pore volume in the wall part 15; B(%) represents the ratio of pores with a pore diameter of 30µm or more to the total pore volume in the wall part 15; and C(%) represents the aperture ratio of the plane perpendicular to the through holes 12, after forming the coated layer and then supporting the catalyst. The filter 10 may preferably further satisfy the expression 2.5 × A/B + 55.5 ‰¤ C. This can further reduce pressure loss. The filter may preferably further satisfy the expression C ‰¤ 2.5 × A/B + 58.0. This can further improve the filtering efficiency against particulate materials.