Patent ID: 9649587
Date: 2017-05-16
CPC Classifications: B01D,C04B,F01N,Y02T

Claim:
1. A ceramic honeycomb structure comprising large numbers of flow paths partitioned by porous cell walls, (a) said cell walls being ceramics comprising cordierite as a main crystal and having porosity of 55-65%; and (b) in a pore diameter distribution in said cell walls measured by mercury porosimetry; (i) a pore diameter d2 at a cumulative pore volume corresponding to 2% of the total pore volume being 100-180 μm; a pore diameter d5 at 5% being 55-150 μm; a pore diameter d10 at 10% being 20 μm or more and less than 50 μm; a pore diameter (median pore diameter) d50 at 50% being 14.6-20.8 μm; a pore diameter d85 at 85% being 6 μm or more and less than 10 μm; a pore diameter d90 at 90% being 4-8 μm; a pore diameter d98 at 98% being 3.5 μm or less; (d10-d90)/d50 being 1.3-2; (d50-d90)/d50 being 0.45-0.7; and (d10-d50)/d50 being 0.75-1.4; (ii) σ[=log (d20)−log (d80)] being 0.39 or less, wherein σ represents the difference between a logarithm of the pore diameter d20 at 20% and a logarithm of the pore diameter d80 at 80%; and (iii) the volume of pores of more than 100 μm being 0.05 cm