Three-way catalyst for gasoline-natural gas applications

摘要

The present invention relates to a three-way conversion catalyst for treating exhaust gas containing NO, CO and HC, wherein the catalyst comprises (i) an inlet end, an outlet end, and extending from the inlet end to the outlet end. A substrate including a plurality of passages defined by an axial length of the substrate and an inner wall of the substrate extending through the passage; (ii) a first coating comprising rhodium supported on a first oxidizing component; (iii) a second coating comprising palladium supported on a non-zeolite oxidizing material, wherein the non-zeolite oxidizing material includes manganese and a second oxidizing component, and 0 to 0.001% by weight of the second coating is platinum Comprising a second coating consisting of; Wherein the first coating is disposed on the surface of the inner wall of the substrate over x% of the axial length of the substrate, and x is in the range of 80 to 100; The second coating extends over y% of the axial length of the substrate from the end of the inlet to the end of the outlet and is disposed on the first coating, where y is in the range of 20 to x.