CPC B01J 23/6562 (2013.01) [B01J 21/04 (2013.01); B01J 37/0244 (2013.01); F01N 3/035 (2013.01); F01N 3/101 (2013.01); F01N 3/0835 (2013.01); F01N 3/0842 (2013.01); F01N 3/0857 (2013.01)] | 15 Claims |
1. A three-way conversion catalyst for the treatment of an exhaust gas comprising nitrogen monoxide, carbon monoxide and hydrocarbon, wherein the catalyst comprises:
(i) 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;
(ii) a first coating comprising rhodium supported on a first oxidic component; and
(iii) a second coating comprising palladium supported on a non-zeolitic oxidic material, wherein the non-zeolitic oxidic material comprises manganese and a second oxidic component, wherein from 0 weight-% to 0.001 weight-% of the second coating consists of platinum;
wherein the first coating is disposed on the surface of the internal walls of the substrate over x % of the substrate axial length and x ranging from 80 to 100;
wherein the second coating extends over y % of the substrate axial length from the inlet end to the outlet end and is disposed on the first coating and y ranging from 20 to x.
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