| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a catalyst for purifying exhaust gas which hardly causes lowering of activity even when used under environment of high temperature and high oxygen concentration. <P>SOLUTION: The catalyst for purifying exhaust gas contains a rare earth element, an alkaline earth element, zirconium and a noble metal, wherein an atomic ratio of the alkaline earth element to the sum of the rare earth element and the zirconium is 0.1 to <10 atomic%, a part of the rare earth element and a part of the zirconium form a composite oxide with at least a part of the alkaline earth element, and the composite oxide and a part of the noble metal form a solid solution. <P>COPYRIGHT: (C)2007,JPO&INPIT |
