Patent ID: 6827754
Filing Date: 2004-12-07
Classification: B01D,B01J,C04B,F01N,Y10S

Abstract:
A ceramic honeycomb filter comprising a ceramic honeycomb structure having porous partition walls defining a plurality of flow paths for flowing an exhaust gas through said porous partition walls to remove particulates from said exhaust gas, the predetermined flow paths among said flow paths being sealed at their ends, said porous partition walls having a porosity of 60-75% and an average pore diameter of 15-25 &mgr;m when measured according to a mercury penetration method, and the maximum of a slope Sn of a cumulative pore volume curve of said porous partition walls relative to a pore diameter obtained at an n-th measurement point being 0.7 or more, said Sn being represented by the following formula (1):Sn=âˆ’(Vnâˆ’Vnâˆ’1)/[log Dnâˆ’log (Dnâˆ’1)]â€ƒâ€ƒ(1), wherein Dn is a pore diameter (&mgr;m) at an n-th measurement point, Dnâˆ’1 is a pore diameter (&mgr;m) at an (nâˆ’1)-th measurement point, Vn is a cumulative pore volume (cm3/g) at an n-th measurement point, and Vnâˆ’1 is a cumulative pore volume (cm3/g) at an (nâˆ’1)-th measurement point.