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 composition comprising a platinum group metal (PGM) component and an inorganic oxide, wherein the Infrared (IR) intensity ratio of bridge CO to atop CO on the PGM component is less than 3:1 under standard CO adsorption procedure.
2 . The catalyst composition of claim 1 , wherein the inorganic oxide is alumina.
3 . The catalyst composition of claim 1 , wherein the inorganic oxide is doped with a dopant.
4 . The catalyst composition of claim 3 , wherein the dopant is selected from the group consisting of La, Sr, Si, Ba, Y, Pr, Nd, and Ce.
5 . The catalyst composition of claim 3 , wherein the dopant content in the inorganic oxide is 10%-30 wt. %.
6 . The catalyst composition of claim 4 , wherein the dopant is La.
7 . The catalyst composition of claim 1 , wherein the PGM is Pd.
8 . (canceled)
9 . (canceled)
10 . A catalyst composition comprising a platinum group metal (PGM) component and an inorganic oxide, wherein the Infrared (IR) intensity ratio of gem-dicarbonyl CO to atop CO on the PGM component is less than 5:1 under standard CO adsorption procedure.
11 . The catalyst composition of claim 10 , wherein the inorganic oxide is alumina.
12 . The catalyst composition of claim 10 , wherein the inorganic oxide is doped with a dopant.
13 . The catalyst composition of claim 12 , wherein the dopant is selected from the group consisting of La, Sr, Si, Ba, Y, Pr, Nd, and Ce.
14 . The catalyst composition of claim 12 , wherein the dopant content in the inorganic oxide is 10%-30 wt. %.
15 . The catalyst composition of claim 13 , wherein the dopant is La.
16 . The catalyst composition of claim 12 , wherein the PGM is Rh.
17 - 50 . (canceled)
51 . 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.
52 . The catalyst article of claim 51 , 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.
53 . The catalyst article of claim 51 , wherein the first inorganic oxide is alumina.
54 . The catalyst article of claim 52 , wherein the dopant for the first inorganic oxide is La.
55 . The catalyst article of claim 51 , wherein the first PGM component is Pd.
56 . (canceled)
57 . (canceled)
58 . (canceled)
59 . The catalyst article of claim 51 , wherein the second PGM component is Rh.
60 . (canceled)
61 . (canceled)
62 . (canceled)