Remarkable oxygen storage capability of oxygen-deficient perovskite manganese oxides

Abstract

Non-stoichiometric oxides which store/release oxygen reversibly at moderate temperatures are called "oxygen-storage materials (=OSMs)". OSMs may be applicable to various high-temperature applications such as oxygen separation, oxygen enrichment, redox catalysts, etc., hence contributing to the improved productivity and environmental protection. To realize such applications, novel OSMs with remarkable oxygen storage capability are highly desirable. We focused on oxygen-deficient perovskite manganese oxides and developed two candidates for high-performance OSMs, i.e., BaYMn₂O_5+d and Ca₂(Al_xMn_1-x)₂O_5+d. In this presentation, remarkable oxygen storage capabilities of these manganese oxides are demonstrated. Also, possible future uses for oxidizing agent and oxygen enrichment are discussed.