Wall flow type exhaust gas purification filter
AssigneeNGK Insulators, Ltd.
InventorYukio Miyairi
Life of this patent
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Abstract
There is provided a wall flow type exhaust gas purification filter is provided with a honeycomb structure having porous ceramic partition walls 12 and plugging portions disposed in one side opening end portions of predetermined cells and the other side opening end portions of the other cells. In the exhaust gas purification filter, when an average pore size is obtained for each region of ⅓ mm×⅓ mm in a range of 10 mm2 in an arbitrary cross section perpendicular to a surface of the partition walls 12, a large pore region having an average pore size of 15 μm or more has an area of 0.1 mm2 or more, and a small pore region having an average pore size of 8 μm or less has an area of 0.1 mm2 or more.
Claims14
A wall flow type exhaust gas purification filter comprising:
- a honeycomb structure having porous ceramic partition walls separating and forming a plurality of cells extending from one end portion to the other end portion and functioning as exhaust gas passages, and
- plugging portions disposed in one side opening end portions of predetermined cells and the other side opening end portions of the other cells,
- wherein, when an average pore size is obtained for each region of ⅓ mm×⅓ mm in a range of 10 mm2 in an arbitrary cross section parallel to a surface of the partition walls, a large pore region having an average pore size of 15 μm or more has an area of 0.1 mm2 or more, and a small pore region having an average pore size of 8 μm or less has an area of 0.1 mm2 or more,
- wherein the average pore size is measured before the catalyst is loaded on the partition walls.
Dependencies are inferred from the claim text.