Patent ID: 8133841

Claim:
A honeycomb catalytic structure comprising: a honeycomb structure comprising porous partition walls having a large number of pores, disposed so as to form a plurality of cells extending between two end faces of the honeycomb structure and plugging portions disposed at either one end of each cell, and a catalyst layer containing a catalyst, supported at least on inner surfaces of the pores of the honeycomb structure, the pores having an average pore diameter of greater than or equal to 50 μm but not more than 500 μm; wherein: a mass of the catalyst layer per unit volume (1 cm 3 ) of the honeycomb structure (g/cm 3 ) is 60% or less of a volume of pores per unit volume (1 cm 3 ) of the honeycomb structure (cm 3 /cm 3 ), the partition walls have a thickness of 0.15 mm to 0.45 mm, a cell density of the honeycomb structure is 100 cpsi to 300 cpsi, and at least part of inner surfaces of pores of the porous partition walls having a large number of pores, disposed so as to form a plurality of cells extending between two end faces of the honeycomb structure, are coated with a substance containing no noble metal.