| 摘要 |
<P>PROBLEM TO BE SOLVED: To remove NOx efficiently in such a transition period that transition is performed to an air-fuel ratio rich state from a state where a catalyst for cleaning exhaust gas has a low temperature and is packed in an air-fuel ratio lean atmosphere. <P>SOLUTION: Activated alumina, a ZrLa multiple oxide, a SrFe multiple oxide and Rh are contained in a catalyst layer 1b arranged on a carrier 1a. At least a part of the activated alumina and at least a part of the ZrLa multiple oxide form a composite particle so that at least a part of the particle surface of the activated alumina is covered with the ZrLa multiple oxide. At least a part of the SrFe multiple oxide and at least a part of the Rh are carried and supported on the composite particle. <P>COPYRIGHT: (C)2013,JPO&INPIT |
