SCR catalyst

Patent metadata

Field	Value
Publication number	US-10512905-B2
Application number	US-201414559099-A
Country	US
Kind code	B2
Filing date	Dec 3, 2014
Priority date	Dec 3, 2013
Publication date	Dec 24, 2019
Grant date	Dec 24, 2019

Abstract

A copper-CHA zeolite catalyst for SCR of NOx is disclosed.

First claim

What is claimed is:

1. A catalyst composition comprising a copper-containing zeolite having a CHA framework, a molar silica-to-alumina ratio (SAR) of at least 40, and an atomic copper-to-aluminum ratio of at least 1.25, wherein the zeolite is essentially free of ion-exchanged copper and the zeolite is essentially free of framework transition metal.

2. The catalyst composition of claim 1 , wherein the copper-to-aluminum ratio is at least 1.5.

3. The catalyst composition of claim 1 , wherein the copper-to-aluminum ratio of at least 2.

4. The catalyst composition of claim 1 , wherein the SAR is 40 to 250.

5. The catalyst composition of claim 1 , wherein the SAR is about 45 to 85.

6. The catalyst composition of claim 1 , copper is present in an amount of about 3 to 5 weight percent, based on the total weight of the zeolite.

7. The catalyst composition of claim 1 , wherein the zeolite contains less than 1.5 weight percent copper oxide.

8. A catalyst article for treating exhaust gas comprising a catalyst composition according to claim 1 disposed on and/or within a substrate.

9. The catalyst article of claim 8 , wherein the substrate is a metal plate.

10. The catalyst article of claim 8 , wherein the substrate is a honeycomb.

11. The catalyst article of claim 10 , wherein the catalyst is a washcoat on the honeycomb.

12. The catalyst article of claim 10 , wherein the honeycomb is an extruded catalyst.

13. The catalyst article of claim 10 , wherein the honeycomb is a wall-flow filter.

14. The catalyst article of claim 10 , wherein the honeycomb is a flow-through honeycomb.

15. A catalyst composition comprising a washcoat slurry comprising a catalyst according to claim 1 and one or more binders.

16. A method for treating an exhaust gas comprising contacting a combustion exhaust gas containing NO x and/or NH 3 with a catalyst composition according to claim 1 to selectively reduce at least a portion of the NO x into N 2 and H 2 O and/or oxidize at least a portion of the NH 3 .

17. A system for treating an exhaust gas containing NOx, the system comprising a catalytic article according to claim 8 and a source of a reductant, wherein the reductant source is upstream of the catalytic article.

18. A catalyst composition comprising a copper-containing zeolite having a CHA framework, a molar silica-to-alumina ratio (SAR) of at least 40, and an atomic copper-to-aluminum ratio of at least 1.25, wherein the zeolite comprises a majority of in-situ copper compared to free copper oxides.

19. A catalyst composition comprising a copper-containing zeolite having a CHA framework, a molar silica-to-alumina ratio (SAR) of at least 40, and an atomic copper-to-aluminum ratio of at least 1.25, wherein the zeolite has a unit cell volume of about 2355 to about 2375 A 3 .

Assignees

• Johnson Matthey Plc

Inventors

• Rivas-Cardona Alejandra
• Fedeyko Joseph Michael
• Chen Hai-Ying

Classifications

• B01J2229/16

  to increase the Si/Al ratio; Dealumination · CPC title

• B01J29/76

  Iron group metals or copper · CPC title

• B01D53/94

  by catalytic processes · CPC title

• B01J37/0225

  of metal substrates · CPC title

• B01J37/0246

  Coatings comprising a zeolite · CPC title