Zeolite and redox oxide combined catalyst body

Patent metadata

Field	Value
Publication number	US-10188985-B2
Application number	US-201615348415-A
Country	US
Kind code	B2
Filing date	Nov 10, 2016
Priority date	Feb 27, 2009
Publication date	Jan 29, 2019
Grant date	Jan 29, 2019

Abstract

Extruded honeycomb catalyst bodies and methods of manufacturing same. The catalyst body includes a first oxide selected from the group consisting of tungsten oxides, vanadium oxides, and combinations thereof, a second oxide selected from the group consisting of cerium oxides, lanthanum oxides, zirconium oxides, and combinations thereof, and a zeolite.

First claim

What is claimed:

1. A method for treating an exhaust stream containing NO x gas comprising contacting a catalytic structure with the exhaust stream, the catalytic structure comprising a first oxide selected from the group consisting of tungsten oxides and vanadium oxides, a second oxide selected from the group consisting of cerium oxides, lanthanum oxides, zirconium oxides, and combinations thereof, and a zeolite, the method further comprising contacting the catalytic structure with the exhaust stream containing NO x gas, wherein the catalytic structure is substantially free of platinum, palladium, and rhodium, and wherein an external layer of the catalytic structure comprises a mixture of the first oxide and the second oxide without the zeolite on a layer comprising the zeolite.

2. The method of claim 1 wherein the temperature of the exhaust stream is less than 200° C. and the NO x gas is catalytically reduced by contact with the structure.

3. The method of claim 1 wherein the temperature of the exhaust stream is greater than 600° C. and the NO x gas is catalytically reduced by contact with the structure.

4. The method of claim 1 wherein the exhaust stream comprises a reductant and the reductant is catalytically activated by contact with the structure.

5. The method of claim 1 wherein the catalytic structure comprises: a first oxide of WO 3 ; a second oxide of CeO 2 —ZrO 2 ; and the zeolite.

6. The method of claim 5 wherein the catalytic structure comprises WO 3 —CeO 2 —ZrO 2 .

7. The method of claim 5 , said catalytic structure comprising a body comprising about 60% to about 81% of WO 3 —CeO 2 —ZrO 2 and about 25% to about 40% of a ZSM-5 zeolite.

8. The method according to claim 1 wherein the temperature of the exhaust stream is less than 200° C. and the NO x gas is catalytically reduced by contact with the structure.

9. The method according to claim 1 wherein the temperature of the exhaust stream is greater than 600° C. and the NO x gas is catalytically reduced by contact with the structure.

10. The method according to claim 1 wherein the exhaust stream comprises a reductant and the reductant is catalytically activated by contact with the catalytic structure.

11. The method of claim 1 wherein the zeolite comprises ZSM-5.

12. The method of claim 1 , wherein the zeolite converts a substantial percentage of the NO x above 400° C. and the first and second oxides convert a substantial percentage of the NO x below 350° C.

Assignees

• Corning Inc
• Dalian Inst Chem & Physics Cas

Inventors

• Ogunwumi Steven Bolaji
• Patil Mallanagouda Dyamanagouda
• Xie Yuming
• Cheng Hao
• Wang Shudong

Classifications

• B01D2255/2065

  Cerium · CPC title

• B01D2255/2063

  Lanthanum · CPC title

• B01D2255/91

  NOx-storage component incorporated in the catalyst · CPC title

• B01J2229/42

  Addition of matrix or binder particles · CPC title

• B01J23/002

  Mixed oxides other than spinels, e.g. perovskite · CPC title