Patent ID: 7887761

Claim:
A honeycomb catalyst comprising: porous partition walls each having a first surface and a second surface and a plurality of pores, the partition walls being arranged to form a plurality of cells that allow communication between two end faces; plugging portions arranged to plug the cells in one of the end faces; and a catalytically active component loaded on the first and second surfaces of the partition walls and inner surfaces of the pores, wherein the catalytically active component-loading pores allow a gas to pass therethrough, and a ratio of a mass (M w ) to a mass (M p ) is (M w ):(M p )=1:3 to 3:1 where (M w ) is a mass of the catalytically active component loaded on the first and second surfaces of the partition walls per unit volume of the partition walls, and (M p ) is a mass of the catalytically active component loaded on the inner surfaces of the pores per unit volume of the partition walls.