| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a ceramic honeycomb filter capable of attaining high initial fine particle collecting efficiency at the beginning of the operation start of a diesel engine or immediately after reproducing the filter and preventing deleterious fine particles from being discharged at an initial stage. <P>SOLUTION: In the ceramic honeycomb filter for removing fine particles contained in exhaust gas by sealing the end of a predetermined flow channel of a ceramic honeycomb structure and passing the exhaust gas through porous partition walls partitioning the flow channel, the porosity of the porous partition wall is 55 to 75%, an average pore diameter is 15 to 40μm, the gross area of the pore opened in the surface of the porous partition wall is 10 to 30% of the gross area of the surface of the partition, and the pores of the which circle equivalent diameters are 5 to 20μm of the pores opened in the surface of the porous partition walls are 300/mm<SP>2</SP>or more. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
