TWC catalysts containing high dopant support
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; and a first catalytic region on the substrate; wherein the first catalytic region comprises a first PGM component and a first inorganic oxide, wherein the IR intensity ratio of bridge CO to atop CO on the PGM component is less than 3:1 under standard CO adsorption procedure.
1. A catalyst article for treating exhaust gas comprising:
a substrate;
a first catalytic region on the substrate, wherein the first catalytic region comprises a first PGM component, and a first inorganic oxide; and
a second catalytic region on the substrate, wherein the second catalytic region comprises a second PGM component, and a second inorganic oxide;
wherein at least one of the first inorganic oxide and the second inorganic oxide is doped with 10-30% dopant; and
wherein the first inorganic oxide is alumina.
2. The catalyst article of claim 1 , wherein the dopant for the first inorganic oxide and/or the second inorganic oxide is each independently selected from the group consisting of La, Sr, Si, Ba, Y, Pr, Nd, and Ce.
3. The catalyst article of claim 1 , wherein the dopant for the first inorganic oxide is La.
4. The catalyst article of claim 1 , wherein the first PGM component is Pd.
5. The catalyst article of claim 1 , wherein the IR intensity ratio of bridge CO to atop CO on the first PGM component is less than 3:1 under standard CO adsorption procedure.
6. The catalyst article of claim 1 , wherein the second inorganic oxide is alumina.
7. The catalyst article of claim 1 , wherein the dopant for the second inorganic oxide is La.
8. The catalyst article of claim 1 , wherein the second PGM component is Rh.
9. The catalyst article of claim 1 , wherein the IR intensity ratio of gem-dicarbonyl CO to atop CO on the second PGM component is less than 5:1 under standard CO adsorption procedure.
10. An emission treatment system for treating a flow of a combustion exhaust gas comprising the catalyst article of claim 1 .
11. A method of treating an exhaust gas from an internal combustion engine comprising contacting the exhaust gas with the catalyst article of claim 1 .