Vanadium SCR catalysts

Patent metadata

Field	Value
Publication number	US-11602736-B2
Application number	US-202016811819-A
Country	US
Kind code	B2
Filing date	Mar 6, 2020
Priority date	Mar 8, 2019
Publication date	Mar 14, 2023
Grant date	Mar 14, 2023

Abstract

Methods and compositions related to a selective catalytic reduction catalyst comprising iron and vanadium, wherein the vanadium is present as (1) one or more vanadium oxides, and (2) metal vanadate of the form Fe x M y VO 4 where x=0.2 to 1 and y=1−x, and where M comprises one or more non-Fe metals when y>0.

First claim

We claim:

1. A selective catalytic reduction catalyst comprising iron, vanadium, and titania, wherein the vanadium is present as (1) one or more vanadium oxides, and (2) metal vanadate of the form Fe x M y VO 4 where x=0.2 to 1 and y=1−x, and where M comprises one or more non-Fe metals when y>0;
wherein the vanadium is present in an amount of about 3 wt % to about 7.5 wt %, expressed as V 2 O 5 wt % of V 2 O 5 +TiO 2 .

2. The selective catalytic reduction catalyst of claim 1 , wherein the catalyst is prepared with a vanadium oxide precursor, and wherein the vanadium oxide precursor comprises vanadyl oxalate, ammonium metavanadate, vanadyl oxysulfate, vanadium pentoxide, vanadyl acetylacetonate, vanadium(III) acetylacetonate, or combinations thereof.

3. The selective catalytic reduction catalyst of claim 1 , wherein M comprises Er, Al, Ce, or combinations thereof, when y>0.

4. The selective catalytic reduction catalyst of claim 1 , wherein the metal vanadate comprises FeVO 4 , Fe 0.5 Ce 0.5 VO 4 , Fe 0.33 Al 0.33 Er 0.33 VO 4 , or combinations thereof.

5. The selective catalytic reduction catalyst of claim 1 , wherein the vanadium is present on a support comprising titania.

6. The selective catalytic reduction catalyst of claim 5 , wherein the titania is doped with W, Si, Mo, Nb, Sb, or combinations thereof.

7. The selective catalytic reduction catalyst of claim 1 , wherein the vanadium is present in an amount of about 3.5 wt % to about 7 wt %, expressed as V 2 O 5 wt % of V 2 O 5 +TiO 2 .

8. The selective catalytic reduction catalyst of claim 1 , wherein the vanadium oxide and metal vanadate are included in a weight ratio, expressed as a ratio of elemental vanadium, of about 6:1 to about 1:2.

9. The selective catalytic reduction catalyst of claim 1 , comprising titania in an amount of about 60 wt % to about 93 wt % of the selective catalytic reduction catalyst.

10. The selective catalytic reduction catalyst of claim 9 , wherein the titania comprises a blend of colloidal titania and a standard micro sized titania.

11. The selective catalytic reduction catalyst of claim 10 , wherein the colloidal titania and standard micro sized titania are present in a weight ratio of about 0.08 to about 0.4.

12. The selective catalytic reduction catalyst of claim 1 , wherein the catalyst further comprises tungsten, wherein the tungsten is included in addition to any tungsten doped on titania.

13. The selective catalytic reduction catalyst of claim 1 , wherein the catalyst further comprises antimony, wherein antimony is included in addition to any antimony doped on titania.

14. The selective catalytic reduction catalyst of claim 1 , wherein the catalyst comprises tungsten and antimony.

Assignees

• Johnson Matthey Plc

Inventors

• Arshad Zuharia
• Arulraj Kaneshalingam
• Chandler Guy
• Leppelt Rainer
• Newman Andrew
• Phillips Paul
• Rowe Oliver
• Smith Christopher
• Spencer Nicholas
• Tingay Isabel
• Walker Rob
• Hemming Oliver
• Raj Agnes

Classifications

• B01J35/56

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

• B01J23/83

  with rare earths or actinides · CPC title

• B01D2258/01

  Engine exhaust gases · CPC title

• B01J37/0221

  of particles · CPC title

• B01J6/001

  Calcining · CPC title