TWC catalysts containing high dopant support

Patent metadata

Field	Value
Publication number	US-11794170-B2
Application number	US-202117455596-A
Country	US
Kind code	B2
Filing date	Nov 18, 2021
Priority date	Jul 27, 2018
Publication date	Oct 24, 2023
Grant date	Oct 24, 2023

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.

First claim

We claim:

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 .

Assignees

• Johnson Matthey Plc

Inventors

• Jing Yuan
• Nagaoka Shuhei
• Shimizu Ken-Ichi
• Toyao Takashi

Classifications

• B01J35/56

  Foraminous structures having flow-through passages or channels, e.g. grids or three-dimensional [3D] monoliths · CPC title

• B01J35/30

  characterised by their physical properties · CPC title

• B01J2235/10

  Infrared [IR] · CPC title

• B01J23/63 Primary

  with rare earths or actinides · CPC title

• B01J21/04

  Alumina · CPC title