Patent ID: 7306771

Claim:
A filter catalyst for purifying exhaust gases comprising: a honeycomb structure including: inlet cells clogged on the downstream side of the exhaust gases; outlet cells neighboring the inlet cells and clogged on the upstream side of the exhaust gases; filter cellular walls demarcating the inlet cells and outlet cells, and having pores of an average pore diameter of from 20 to 40 μm; and a catalytic layer formed on the filter cellular walls and on the inside surface of the pores, and having: a first catalyst support having a first thickness, comprising a porous oxide material with an average particle diameter of 1 μm or less, and being arranged along the inside surface of the pores of the filter cellular walls; a second catalyst support having a second thickness greater than the first thickness of the first catalyst support, comprising a porous oxide material with an average particle diameter within a range from about 1/20 to ½ of the average pore diameter of the filter cellular walls, and being arranged in the pores of the filter cellular walls so as to partially cover the first catalyst support; and a catalytic ingredient.