| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a catalyst for cleaning exhaust gas having an enhanced HC (hydrocarbon) oxidation activity of palladium efficiently and an enhanced cleaning efficiency of HC released from a cleaning catalyst layer. <P>SOLUTION: The catalyst is produced in such a way that a HC adsorbent layer and a catalyst component layer are laminated consecutively on an integrated structural carrier installed in the exhaust gas passage of an internal combustion engine, that the catalyst component layer contain inorganic oxides dispersed with alkali metals and alkaline earth metals and Pd, and that the HC released from the HC adsorbent layers is cleaned. The above catalyst is obtained by drying and burning the inorganic oxide after the alkali metals and the alkaline earth metals are mixed with inorganic oxide precursor salts or sols homogeneously. <P>COPYRIGHT: (C)2004,JPO |
