Patent ID: 7977276

Claim:
An exhaust gas purifying catalyst, comprising: at least one catalyst layer formed on an inner surface of a substrate and comprising a catalyst powder of individual catalyst powder particles, wherein each individual catalyst powder particle comprises: a noble metal, a first compound to which the noble metal is chemically anchored; and a second compound configured to physically enclose and separate the first compound coupled to the noble metal from another first compound coupled to another noble metal; wherein the at least one catalyst layer has fine pores P 2 between the individual catalyst powder particles with a pore diameter of greater than 0.1 μm and less than or equal to 1 μm and wherein each individual catalyst powder particle has fine pores P 1 within the catalyst powder particles with a pore diameter of 0.1 μm or less, and a pore volume of the fine pores P 2 with the pore diameter of greater than 0.1 μm and less than or equal to 1 μm is equal to 10% to 60% of a fine pore volume of the fine pores with the pore diameter of 1.0 μm or less.