Multi-layer TWC formulations with optimalized PGM loadings
AssigneeJohnson Matthey Public Limited Company
InventorsDongxia Liu, Maria C. Vlachou, Amy Louise Kolpin, Peter Charles Stonehouse
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Abstract
A catalyst article for treating exhaust gas comprising: a substrate comprising an inlet end, an outlet end with an axial length L; a first catalytic region comprising a first palladium component; a second catalytic region comprising a second rhodium component; a third catalytic region comprising a third palladium component; wherein the first catalytic region is adjacent to the second catalytic region; and wherein the first palladium component and the second rhodium component have a weight ratio of from 3:1 to 19:1, based on element.
Claims20
A catalyst article for treating exhaust gas comprising:
- a substrate comprising an inlet end, an outlet end with an axial length L;
- a first catalytic region comprising a first palladium component, a first oxygen storage capacity (OSC) material, and a first inorganic oxide, wherein the first OSC material and the first inorganic oxide have a weight ratio of 10:1 to 1:10;
- a second catalytic region comprising a second rhodium component;
- a third catalytic region comprising a third palladium component;
- wherein the first catalytic region is adjacent to the second catalytic region;
- wherein the first palladium component and the second rhodium component have a weight ratio of from 3:1 to 10:1, based on element;
- and,
- wherein the second catalytic region extends for 100% of the axial length L.
Dependencies are inferred from the claim text.