| abstract |
(57) [Problem] To provide an exhaust gas purifying catalyst emitted from an internal combustion engine of an automobile or the like. SOLUTION: In a perovskite structure, a composition ratio of a B-site element to an A-site element ｛(BA) / B｝ ratio = α is larger than 0, and the general formula (A ′ 1−x A ″ x ) 1-α (B ′ 1-y B ″ y ) O 3-δ (where A ′ is La, N A ″ is composed of at least one selected from the group consisting of Pr, Ce, Ba, Sr, Ca and K, and A ′ is composed of at least one selected from the group consisting of d, Gd, and Y; B ″ is a different element, Mn, Co, T and at least one selected from the group consisting of i, Fe, Ni, Cu and Al), and the possible ranges of α, δ, x, and y are respectively 0.1 <α < 0.15, 0 ≦ δ ≦ 1, 0 ≦ x ≦ 1, 0 ≦ y ≦ 1, at least Pd is supported as a noble metal on an A-site-deficient perovskite composite oxide, Original catalyst. |