Patent ID: 7981829

Claim:
An exhaust gas purifying catalyst, characterized by comprising: a composite oxide represented by the following formula: (A a-w-x M w M′ x )(Si 6-y N y )O 27-z wherein A is a cation of at least one element selected from the group consisting of La and Pr; M is a cation of at least one element selected from the group consisting of Ba, Ca, and Sr; M′ is a cation of at least one element selected from the group consisting of Nd, Y, Al, Pr, Ce, Sr, Li, and Ca; N is a cation of at least one element selected from the group consisting of Fe, Cu, and Al; and the following relations are satisfied: 6≦a≦10, 0<w<5, 0≦x<5, 0<w+x≦5, 0≦y≦3, 0≦z≦3, A≠M′, and x≠0 when A is a cation of La; and a noble metal ingredient which forms a solid solution with the composite oxide or is supported on the composite oxide.