Patent ID: 11878263
Assignee: DENSO CORPORATION
Field: Chemical engineering (Chemistry)
Classification: CPC B  F  C  Y | IPC B  F

Claim 0:
1. An exhaust gas purification filter configured to be disposed in an exhaust passage in a gasoline engine, the exhaust gas purification filter comprising:
partition walls each comprising a plurality of pores;
a plurality of cells partitioned by the partition walls; and
sealing portions alternately sealing ends of the plurality of the cells in the exhaust gas purification filter, wherein
the partition walls each:
have an average pore diameter of more than 16 μm and less than 21 μm; and
have a ratio of an average surface opening diameter of the pores in a partition wall surface to the average pore diameter of the partition wall of 0.66 or more and 0.94 or less,

wherein:
a length of the exhaust gas purification filter is longer than 20 mm in a filter axial direction;
wherein the exhaust gas purification filter is configured and adapted so that, with accumulated ash components of 20 g/L to 40 g/L, an amount of the accumulated ash components is greater at a position of 10 mm from a filter end surface on an exhaust gas inflow side than at a central position between the filter end surface on the exhaust gas inflow side and a filter end surface on an exhaust gas outflow side; and
a gas permeability coefficient ratio kc/k10 has a value in a range of 1.0 to 1.5, where k10 is a gas permeability coefficient of the partition wall at the position of 10 mm from the filter end surface on the exhaust gas inflow side and kc is the permeability coefficient of the partition wall at the central position between the filter end surface on the exhaust gas inflow side and the filter end surface on the exhaust gas outflow side.