Ceramic honeycomb structure

摘要: A ceramic honeycomb structure, comprising one columnar porous member or the combination of a plurality members which is formed by longitudinally arranging large number through-pores parallel with each other through partition walls and sealing either end part these through-pores, characterized in that forming structure has surface roughness 10 µm higher maximum height rough Rz specified JIS B 0601-2001, an average pore diameter 5 to 100 when distribution measured mercury penetration method, where ratio pores diameters 0.9 1.1 times total volume A% thickness (µm), requirement following expression can be satisfied. > 90 - B/20 < B/20. Thus, effective having excellent pressure loss collecting efficiency high catalyst reactivity provided.