| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a cleaning catalyst for a hydrocarbon-containing exhaust gas high in adsorption capacity of every lower and higher hydrocarbon and bringing about high combustion efficiency. <P>SOLUTION: The cleaning catalyst for the hydrocarbon-containing exhaust gas is obtained by supporting a combustion catalyst composition, (1) which contains a zeolite adsorbent wherein Ag and at least one component among Mg, Sr, Ca and Ba on zeolite having an SiO<SB>2</SB>/Al<SB>2</SB>O<SB>3</SB>ratio of not less than 15, Ce being a cocatalyst component and a combustion catalyst active component, on a honeycomb carrier. Zeolite (2) is H-type β zeolite. The carrying amount of Ag (3) is 2-10% by weight to zeolite and the supporting amount of at least one of Mg, Sr, Ca and Ba is 0.2-1.5 (molar ratio) based on the carrying amount of Ag. <P>COPYRIGHT: (C)2004,JPO |
