Three-way conversion catalyst in gasoline-natural gas applications

A process for preparing a three-way conversion catalyst comprising:

• (a) providing a substrate comprising an inlet end, an outlet end, a substrate axial length extending from the inlet end to the outlet end and a plurality of passages defined by internal walls of the substrate extending therethrough;
• (b) preparing a slurry comprising rhodium, a first oxidic component and water;
• disposing the slurry on the surface of the internal walls of the substrate over x % of the substrate axial length, from the inlet end to the outlet end of the substrate, or from the outlet end to the inlet end of the substrate, with x ranging from 80 to 100;
• calcining the obtained slurry-treated substrate, obtaining a substrate coated with a first coating;
• (c) preparing a slurry comprising water, palladium and a non-zeolitic oxidic material, comprising manganese and a second oxidic component;
• disposing the slurry on the first coating of the coated substrate obtained in (b) over y % of the substrate axial length from the inlet end to the outlet end of the substrate, with y ranging from 20 to x;
• calcining the obtained slurry-treated substrate, obtaining a substrate coated with a first coating and a second coating, wherein the second coating consist of 0 weight-% to 0.001 weight-% of platinum.