Perovskite-type oxidation catalysts and method for preparing the catalysts.

摘要

An oxidation catalyst of the perovskite-type compound oxide which comprises, as A site. a mixture of rare earth elements from ores, part of which is replaced by at least one element selected from alkali metals, alkaline earth metals and rare earth elements other than the ore-originating elements, and a transition metal as B site. The surface atomic ratio of the mixed rare earth elements and the transition metal is in the range of 1.0:1.0 to 1.1.:1.0. A method for preparing the compound oxide is also described.