Patent ID: 7517830

Claim:
A substrate for an exhaust-gas purifying filter catalyst comprising a catalytic layer formed on the substrate, comprising a honeycomb structure including: inlet cells clogged on a downstream side of exhaust gases; outlet cells neighboring the inlet cells and clogged on an upstream side of exhaust gases; and cellular walls demarcating the inlet cells and the outlet cells and having pores, wherein more than 8% of total opening area of all surface vacancies that the pores are open on the surface of the cellular walls is occupied by total opening area of surface vacancies having maximum diameter of from 10 to 50 μm measured by a direct observation method, and more than 20% of total cross-sectional area of all pores is occupied by total cross-sectional area of pores having cross-sectional area equivalent to that of a circle having diameter more than 300 μm measured by cross-sectional observation using computed tomography (CT) scan.