| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an exhaust gas cleaning system suitable for a diesel engine operated in lean atmosphere, and high in space velocity of the exhaust gas, and a ternary oxidation catalyst excellent in thermal storage effect, used for the same. <P>SOLUTION: The exhaust gas cleaning system is arranged for use in an exhaust gas passage of the diesel engine, and has the ternary oxidation catalyst upstream against the exhaust gas flow direction, and a catalyst for the exhaust gas cleaning, having NOx trapping function and HC trapping function downstream. In the system, a catalyst coat layer containing the ternary oxidation catalyst is formed on a cell wall of a monolithic carrier, and a total thickness of the cell wall thickness and the thinnest portion of the catalyst coat layer thickness formed on the cell wall is 50-650 μm. The ternary oxidation catalyst used for it is provided. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
