EXHAUST GAS PURIFICATION FILTER, EXHAUST GAS PURIFIER, AND METHOD OF USING EXHAUST GAS PURIFIER

摘要

An exhaust gas purification filter includes: a honeycomb structure body having partition walls for defining a plurality of cells that extend from an inflow end face to an outflow end face; an inflow side plugging portion; an outflow side plugging portion; and a porous surface trapping layer which is disposed on an inflow surface which is a surface on an inflow cell side which is the cell in which the outflow side plugging portion is disposed, among surfaces of the partition walls, in which the surface trapping layer has a thickness of 10 to 60 μm and an average pore diameter of 0.3 to 5 μm, and in a section which is parallel to a cell extending direction.

主权项

1. An exhaust gas purification filter, comprising:
a pillared honeycomb structure body having porous partition walls for defining a plurality of cells that extend from an inflow end face as one end face to an outflow end face as the other end face; inflow side plugging portions disposed on the inflow end face side of predetermined cells of the cells; outflow side plugging portions disposed on the outflow end face side of the residual cells of the cells; and a porous surface trapping layer disposed on an inflow surface which is a surface on an inflow cell side which is the cell in which the outflow side plugging portion is disposed, among surfaces of the partition walls, wherein the surface trapping layer has a thickness of 10 μm to 60 μm, the surface trapping layer has an average pore diameter of 0.3 μm to 5 μm, and in a section of the partition wall which is parallel to a cell extending direction, when a region between a position at 10% of a length of the partition wall in a thickness direction thereof and a position at 90% of the length of the partition wall in the thickness direction thereof is referred to as a central region and a region between the central region and the surface trapping layer is referred to as an inlet region, a porosity P1 of the central region is lower than a porosity P2 of the inlet region.