MANGANESE OXIDE EXCELLENT IN OXYGEN STORAGE ABILITY, VARIOUS MATERIALS INCLUDING THE OXIDE, METHOD AND APPARATUS USING THE OXIDE

摘要

PPROBLEM TO BE SOLVED: To provide an inexpensive and practical metal oxide featured by (a) being provided with a large oxygen-storage capacity and chemical stability in a high temperature region; (b) being provided with an oxygen-releasing function different from that of CZ (CeOSB2/SB-ZrOSB2/SB), i.e. a function absorbing and releasing oxygen by only temperature changes; and (c) comprising no expensive element as constituting components; as a substance applicable to a catalyst material for emission gas purification, a catalyst material of oxygen-reducing agent, a positive-electrode material of a solid oxide fuel cell, an oxygen separator, an oxygen remover, an oxygen selector, an oxygen enricher or the like. PSOLUTION: This manganese oxide excellent in oxygen storage capacity has oxygen absorbing and releasing characteristics functioning by only temperature changes in a temperature region ranging from 400C to 600C, and is expressed by the formula (1): (CaSB2-x/SBASBx/SB)(MnSB2-y/SBBSBy/SB)OSB5+/SB, wherein A is one or two or more kinds of alkaline earth metal other than Ca; B is one or two or more kinds from among Al, Fe, Co and Ga; and x, y and satisfy formulae 0x2, 0y2 and 00.5, respectively. PCOPYRIGHT: (C)2011,JPO&INPIT