| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an exhaust gas purifying catalyst capable of highly suppressing HC poisoning of Pd and efficiently purifying NO<SB>X</SB>in exhaust gas of lean-burn engine by being used as an upstream catalyst of an NO<SB>X</SB>occluding reducing type catalyst. <P>SOLUTION: The exhaust gas purifying catalyst comprises a carrier containing at least an aluminate of at least one kind of metal M selected from alkali earth metal and rare earth metal and at least Pd deposited on the carrier. The metal M and Pd act efficiently and the HC poisoning of Pd can be effectively suppressed. Further, upon high temperature durability, particle growth of metal M is suppressed and, therefore, the HC poisoning of Pd can be effectively suppressed even after the use at a high temperature. Accordingly, by being used as an upstream catalyst of the NO<SB>X</SB>occluding reducing type catalyst, a large quantity of HC can be supplied to the NO<SB>X</SB>occluding reducing type catalyst in the stoichiometric to rich atmosphere. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
