Twc catalysts containing high dopant support

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; 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)