| 摘要 |
A cordierite-based ceramic honeycomb filter comprising a honeycomb structure having a large number of flow paths partitioned by porous cell walls, and plugs alternately formed in said flow paths on the exhaust-gas-inlet side or the exhaust-gas-outlet side for permitting an exhaust gas to pass through said porous cell walls to remove particulate matter from the exhaust gas, said porous cell walls having porosity of 45-58%, an average pore size of 15-30 mum, the volume of pores having pore sizes exceeding 50 mum being more than 10% and 25% or less of the total pore volume, the volume of pores having pore sizes of 100 mum or more being 1-8% of the total pore volume, the volume of pores having pore sizes of less than 10 mum being 3-10% of the total pore volume, and said pores having a pore size distribution deviation sigma [=log(D20)-log(D80)] of 0.6 or less, wherein D20 represents a pore size (mum) at a pore volume corresponding to 20% of the total pore volume, and D80 represents a pore size (mum) at a pore volume corresponding to 80% of the total pore volume, both in a curve representing the relation between the pore size and the cumulative pore volume, and D80<D20.
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