| 摘要 |
There is disclosed a honeycomb catalyst body having a high mechanical strength, an excellent exhaust gas purification performance, and less pressure loss. The honeycomb catalyst body includes a honeycomb structure 10 having porous partition walls 1 with which a plurality of cells 2 are defined and formed, outflow side plugged portions 8a, inflow side plugged portions 8b, and catalyst layers 5 formed on the surfaces of the partition walls 1 on the side of the outflow cells, the cells 2 of the honeycomb structure 10 are formed so that an open area of each outflow cell in a cross section of the outflow cell which is vertical to a cell extending direction is larger than an open area of each inflow cell in the cross section of the outflow cell which is vertical to the cell extending direction, a porosity of the partition walls 1 of the honeycomb structure 10 is from 25 to 55%, and in a cross section parallel to the extending direction of the cells 2, a total area of the catalyst layers 5 formed on the surfaces of the pores in the partition walls 1 is 5% or less of a total area of the pores in the partition walls 1. |
