| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a porous honeycomb structure which can effectively achieve an improvement in the efficiency of catching and storing soot or the like, the reduction of pressure drop, an improvement in the cleaning performance by the effective utilization of a catalyst and prolonging of the time for catching and storing the soot or the like and can eventually improve the elution threshold and isotatic strength during the regeneration of a filter. <P>SOLUTION: The porous honeycomb structure which is provided with the partitions of porous ceramics consisting essentially of cordierite, having 55 to 75% of porosities and 15 to 35 μm of mean pore diameter and having a pore distribution expressed by Lr>0.3xP/100+0.91 (1) is provided. In the expression, Lr signifies a mean ratio of development lengths and P signifies the porosities obtained from a total pore volume when the total pore volume is measured by a mercury pressed into type porosimeter and the the true specific gravity of the cordierite is determined as 2.52 g/cc. <P>COPYRIGHT: (C)2004,JPO |
