| 摘要 |
PROBLEM TO BE SOLVED: To provide an oxygen storing/release material which can develop a high level of oxygen storing/release capability without use of any noble metal such as Pt and, at the same time, is inexpensive. SOLUTION: This oxygen storing/release material comprises a ceria-containing carrier and iron oxide as active species contained in the carrier. A reduction reaction of Fe<SB>2</SB>O<SB>3</SB>occurs at a lower temperature than a reduction reaction of CeO<SB>2</SB>. Prior to CeO<SB>2</SB>, Fe<SB>2</SB>O<SB>3</SB>is reduced to Fe<SB>3</SB>O<SB>4</SB>, FeO or Fe, and, in a reducing atmosphere, oxygen transfer from the carrier to the active species "Fe" is accelerated. In an oxidizing atmosphere, independently of the presence of the active species, an oxidation reaction of the active species and the carrier proceeds very rapidly, and the carrier, in which the amount of oxygen is insufficient, takes in oxygen from the atmosphere. Further, the oxygen storing/release capability of the iron oxide per se is also added, and, consequently, a high level of oxygen storing/release capability can be developed. COPYRIGHT: (C)2005,JPO&NCIPI |
