| 摘要 |
PROBLEM TO BE SOLVED: To suppress the formation of sulfate on a catalyst supporting layer and the accumulation of formed sulfate on the catalyst supporting layer by adding specific metal sulfate to the catalyst supporting layer. SOLUTION: An oxidizing catalyst for diesel exhaust gas consists of a carrier base material, the catalyst supporting layer formed on the surface of the carrier base material and the metal catalyst supported on the catalyst supporting layer. The catalyst supporting layer contains a sulfate of a metal selected from among Ca, Ag, Ba, K, La, Pb, Tl and Y. That is, a sulfate selected from among CaSO4 , Ag2 SO4 , BaSO4 , K2 SO4 , La2 (SO4 )2 , PbSO4 , Tl2 SO4 and Y2 (SO4 )3 is added to the catalyst supporting layer and one of them can be used and a plurality of kinds of them can be used. The formation of a sulfate on the catalyst supporting layer is suppressed and the adsorption/accumulation of the sulfate is also suppressed and the discharge of the sulfate is prevented. |
