Three-zone two-layer TWC catalyst in gasoline waste gas applications
AssigneeJohnson Matthey (Shanghai) Chemicals Limited
InventorsWenjie Dong, Hongyu Ji, Dongsheng Qiao, Yaping Wan
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Abstract
A three-way catalyst article, and its use in an exhaust system for internal combustion engines, is disclosed. The catalyst article for treating exhaust gas comprising: a substrate comprising an inlet end, an outlet end with an axial length L; an inlet catalyst layer beginning at the inlet end and extending for less than the axial length L, wherein the inlet catalyst layer comprises an inlet palladium component; an outlet catalyst layer beginning at the outlet end and extending for less than the axial length L, wherein the outlet catalyst layer comprises an outlet rhodium component; and wherein the outlet catalyst layer overlaps with the inlet catalyst layer.
Claims15
A catalyst article for treating exhaust gas comprising:
- a substrate comprising an inlet end, an outlet end with an axial length L;
- an inlet catalyst layer beginning at the inlet end and extending for less than the axial length L, wherein the inlet catalyst layer comprises an inlet palladium component;
- an outlet catalyst layer beginning at the outlet end and extending for less than the axial length L, wherein the outlet catalyst layer comprises an outlet rhodium component;
- wherein the outlet catalyst layer overlaps with the inlet catalyst layer;
- wherein the inlet catalyst layer is essentially free of PGM metals other than the inlet palladium component;
- and
- wherein the outlet catalyst layer is essentially free of PGM metals other than the outlet rhodium component.
Dependencies are inferred from the claim text.