| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a catalyst for cleaning exhaust gas which is excellent in HC removal efficiency, especially in the HC removal efficiency when starting an engine. <P>SOLUTION: The catalyst for cleaning the exhaust gas is made by laminating an HC adsorbent layer, an activated HC generation layer, and a catalytic component layer on an integral carrier in this order. The activated HC generation layer performs the partial decomposition and oxygenation of HC desorbed from the HC adsorbent layer and promotes the oxidizable properties of the HC to activate the HC. The activated HC generation layer contains materials such as the oxides of the prescribed elements, alumina carrying the prescribed elements, and prescribed elements. The prescribed elements are rare earth elements, group IV B elements, group V B elements, group VI B elements, group VII B elements, group VIII elements, etc. <P>COPYRIGHT: (C)2004,JPO |
