| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a composite material for easily releasing carbon dioxide which has remarkably improved CO shift performance by promoting the release of CO<SB>2</SB>, and to provide a hydrogen enrichment catalyst, an exhaust gas cleaning catalyst, an exhaust gas cleaning catalyst system and an exhaust gas cleaning system in each of which the composite material is used. <P>SOLUTION: The composite material for easily releasing carbon dioxide has such a structure that a phase of CeO<SB>2</SB>is in contact with a phase of an M-Zr compound oxide (wherein M is lanthanide) and easily releases the CO<SB>2</SB>bonded to the phase of CeO<SB>2</SB>. The hydrogen enrichment catalyst is obtained by depositing Pt on this composite material. The exhaust gas cleaning catalyst contains the hydrogen enrichment catalyst. The exhaust gas cleaning catalyst system is composed of the exhaust gas cleaning catalyst and an NOx removal catalyst. The exhaust gas cleaning system is provided with the exhaust gas cleaning catalyst, so that the atmosphere of exhaust gas is varied between a hydrogen-lean atmosphere and a hydrogen-rich atmosphere and the exhaust gas having the varied atmosphere is supplied to the exhaust gas cleaning catalyst. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
