| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a catalyst for cleaning exhaust gas capable of improving the cleaning rate of exhaust gas by effectively utilizing a catalyst layer. <P>SOLUTION: The catalyst 1 for cleaning exhaust gas is composed of: a honeycomb base material 2 having inner walls 21 for partition into a plurality of cell flow passages 4 extending to the flow direction of exhaust gas; and the catalyst layer 3 which cover the inner walls 21, wherein the ratio (ψ2) of the macroporosity of the catalyst layer with respect to the thickness of the catalyst layer in the cross section of the radial direction of a downstream part 12 on the downstream side of the catalyst 1 for cleaning exhaust gas in the flow direction G of exhaust gas is made larger than the ratio (ψ1) of the macroporosity of the catalyst layer with respect to the thickness of the catalyst layer in the cross section of the radial direction of an upstream part 11 on the upstream side of the downstream part 12. <P>COPYRIGHT: (C)2009,JPO&INPIT |
