| abstract |
PURPOSE:To provide a ternary catalyst restraining the elongation of metallic foil at high temp., not causing the exfoliation of a coating layer on the foil and used for the simultaneous removal of hydrocarbon(HC), CO and NOx. CONSTITUTION:Two or more alumina layers are formed on the substrate of a honeycomb carrier made of a metal and one or more among Pt, Pd and Rh are incorporated into the alumina layers to obtain a catalyst. The first layer brought into contact with the substrate of the honeycomb carrier does not contain Ce. |