Zeolite and redox oxide combined catalyst body

Patent metadata

Field	Value
Publication number	US-9492811-B2
Application number	US-201013202830-A
Country	US
Kind code	B2
Filing date	Feb 26, 2010
Priority date	Feb 27, 2009
Publication date	Nov 15, 2016
Grant date	Nov 15, 2016

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 NO reducing catalytic structure, comprising:
a first oxide of WO 3 ;
a second oxide of CeO 2 —ZrO 2 ; and
a zeolite,
wherein the first oxide, namely WO 3 , and the second oxide, namely CeO 2 and ZrO 2 , are expressed as WO 3 —CeO 2 —ZrO 2 , and the second oxide, namely CeO 2 and ZrO 2 , is a solid solution of CeO 2 and ZrO 2 ,
wherein the catalyst 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 zeolite on a layer comprising the zeolite.

2. The catalytic structure of claim 1 wherein the catalytic structure reduces NO x gas by at least 30% at a temperature of 200° C. to 600° C.

3. The catalytic structure of claim 1 wherein the catalytic structure reduces NO x gas by at least 30% at a temperature of greater than or equal to 200° C.

4. The catalytic structure of claim 1 wherein at least part of the catalytic structure is in the form of a honeycomb body comprising a matrix of walls.

5. The catalytic structure of claim 1 , further comprising a body, and
wherein the zeolite is chosen from ZSM-5.

6. The catalytic structure of claim 5 wherein the body comprises a plurality of walls defining a plurality of parallel channels.

7. The catalytic structure of claim 6 wherein the body is honeycomb shaped.

8. The catalytic structure of claim 6 wherein the walls of the body comprise an external layer comprised of WO 3 —CeO 2 —ZrO 2 .

9. The catalytic structure of claim 6 wherein the walls of the body are substantially comprised of the zeolite.

10. The catalytic structure of claim 9 wherein the walls of the body are coated with a layer of WO 3 —CeO 2 —ZrO 2 .

11. The catalytic structure of claim 6 wherein the walls of the body are substantially comprised of a mixture of WO 3 —CeO 2 —ZrO 2 and the zeolite.

12. The catalytic structure of claim 11 wherein the walls of the body are formed from extrusion of the mixture.

13. The catalytic structure of claim 6 wherein the walls of the body are comprised of ceramic, metal, or a combination thereof.

14. The catalytic structure of claim 13 wherein the walls of the body are coated with a layer of the zeolite and a layer of WO 3 —CeO 2 —ZrO 2 .

15. The catalytic structure of claim 13 wherein the walls of the body comprise cordierite, aluminum titanate, mullite, silicon carbide, silicon nitride, or mixtures thereof.

Assignees

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

Inventors

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

Classifications

• B01J37/0244

  Coatings comprising several layers · CPC title

• C04B35/18

  rich in aluminium oxide · CPC title

• B01J35/04

  Operations & Transport · mapped topic

• B01D2255/504

  ZSM 5 zeolites · CPC title

• C04B35/48

  based on zirconium or hafnium oxides, zirconates, {zircon} or hafnates · CPC title