| abstract |
A honeycomb structure that realizes high trapping efficiency for particulate matter (PM) contained in an exhaust, low initial pressure loss and inhibition of any increase of pressure loss by PM trapping. The honeycomb structure consists of a silicon carbide porous ceramic and has multiple unidirectionally extending cells aligned in parallel and partitioned by multiple cell walls. In the honeycomb structure, the average value of pore diameters of the cell walls as measured by mercury penetration method is in the range of 1 to 15 μm, and the standard deviation of pore diameter distribution having the pore diameters expressed by common logarithm is 0.20 or below. The ratio of pores of less than 2 μm pore diameter to all the pores is 5 vol.% or below. |