| 摘要 |
<P>PROBLEM TO BE SOLVED: To enhance reaction efficiency by allowing a catalyst supported in pores of a partition wall to sufficiently contact particulates, and reduce the frequency of the regeneration work of a filter. <P>SOLUTION: The honeycomb filter comprises an end surface 3 on an inflow side and an end surface 5 on outflow side of gas to be treated, the porous partition wall 7 extending from the end surface 3 on the inflow side to the end surface 5 on the outflow side, and a plurality of flow holes partitioned by the partition wall 7 and piercing through from the end surface 3 on the inflow side to the end surface 5 on the outflow side. In the end surface 3 on the inflow side, prescribed flow holes 9a are sealed. In the end surface 5 on the outflow side, residual prescribed flow holes 9b are sealed. When the gas to be treated passes through the partition wall 7 coated with the catalyst, particulates in the gas are collected with the partition wall 7. The honeycomb filter has an average pore diameter of a gas inlet side surface 7a of 20 micrometers or more, and is formed so that an opening area of a gas outlet side surface 7b of the partition wall 7 is 4-90% of the opening area of the gas inlet side surface 7a of the partition wall 7. <P>COPYRIGHT: (C)2004,JPO |
