| 摘要 |
PROBLEM TO BE SOLVED: To provide an OSC (oxygen storage capacity) material with heat resistance which can suppress agglomeration of catalyst metal and deterioration of an OSC function by suppressing crystal growth of crystallites, and to provide an exhaust gas purifying catalyst comprising the OSC material.SOLUTION: An exhaust gas purifying catalyst includes a carrier comprising an oxide functioning as an OSC material. The carrier comprises oxide particles in which the following two kinds of crystallites coexist: crystallites A comprising an oxide containing at least one of zirconium (Zr) and cerium (Ce); and crystallites B comprising an oxide containing at least one of zirconium (Zr) and cerium (Ce). The content (mol%) of Zr and/or Ce in the oxide of the crystallites B is different from that in the oxide of the crystallites A. The specific surface area of the oxide particles after heat treatment at 1,150°C for 5 hours in the atmosphere is 35 m/g or more. |
