| abstract |
Provided is an oxidation catalyst for diesel which can reduce the production cost while maintaining the performance of the oxidation catalyst. (5) and a downstream-side inner catalyst layer (6) with respect to a flow direction of the exhaust gas, wherein the downstream-side inner catalyst layer (6) is divided into a plurality of catalyst layers each containing at least one of Pt and Pd, Pd is contained in the upstream-side catalyst layer 5 and the downstream-side inside-side catalyst layer 6, and Pt is contained in the downstream-side outside catalyst layer 7 so as to cover the surface of the downstream- The amount of Pt and Pd contained in the upstream catalyst layer 5 and the amount of Pt and Pd contained in the downstream catalyst layer 6 are always set to be constant, The amount of Pt contained in the catalyst layer 7 is set. |