Use of mixed oxides as oxygen storage components

Patent metadata

Field	Value
Publication number	US-10058851-B2
Application number	US-201415039923-A
Country	US
Kind code	B2
Filing date	Nov 25, 2014
Priority date	Nov 29, 2013
Publication date	Aug 28, 2018
Grant date	Aug 28, 2018

Abstract

The present invention is concerned with the use of certain oxygen storage components. In particular, the use of special mixed oxides as oxygen storage components in exhaust catalysis is disclosed.

First claim

The invention claimed is:

1. An automotive exhaust catalyst comprising an oxygen storage component, said oxygen storage component comprising:
a binary, ternary or higher mixed oxide consisting of the formula
(M1) n (M2) b (M3) c (M4) d (M5) e (M6) f (M7) g O x

wherein
0≤a, b, c, d, e, f, g≤20 with at least a and b>0;
and x adapts a value to compensate the positive charge originating from the metal cations M1-M7 being selected from the group consisting of Fe, Mn, V, Nb, Ta, Mo, and W.

2. The automotive exhaust catalyst of claim 1 ,
further comprising catalytically active precious metals selected from the group consisting of Cu, Ag, Au, Pt, Pd, Rh, Ru, Ir and mixtures thereof.

3. The automotive exhaust catalyst of claim 2 , wherein the mixed oxide is supported on a high surface area refractory metal oxide support having a surface area of at least 50 m 2 /g.

4. The automotive exhaust catalyst of claim 1 ,
wherein the mixed oxide is supported on a high surface area refractory metal oxide support having a surface area of at least 50 m 2 /g.

5. The automotive exhaust catalyst of claim 1 ,
wherein a is from >0-20, b is from >0-20, c is from 0-5 and d, e, f, g is from 0-5.

6. The automotive exhaust catalyst of claim 1 ,
wherein only M1-M5 are present and selected from the group consisting of Fe, Mn, V, Nb and W.

7. The automotive exhaust catalyst of claim 1 ,
wherein the oxygen storage component has an absolute oxygen storage capacity of at least 8000 μg O 2 /mmol oxygen storage component.

8. The automotive exhaust catalyst of claim 1 , which is free of ceria.

9. A method for storing oxygen in exhaust catalysis, comprising:
introducing onto a support a binary, ternary or higher mixed oxide consisting of the formula
(M1) a (M2) b (M3) c (M4) d (M5) e (M6) f (M7) g O x

wherein
0≤a, b, c, d, e, f, g≤20 with at least a and b>0;
and x adapts a value to compensate the positive charge originating from the metal cations M1-M7 being selected from the group consisting of Fe, Mn, V, Nb, Ta, Mo, and W as an oxygen storage component, and
supplying exhaust gas to the binary, ternary or higher mixed oxide.

10. The method of claim 9 , further comprising introducing onto the support catalytically active precious metals selected from the group consisting of Cu, Ag, Au, Pt, Pd, Rh, Ru, Ir and mixtures thereof.

11. The method of claim 9 , wherein the mixed oxide is supported on a high surface area refractory metal oxide support having a surface area of at least 50 m 2 /g.

12. The method of claim 9 , wherein a is from >0-20, b is from >0-20, c is from 0-5 and d, e, f, g is from 0-5.

13. The method of claim 9 , wherein only M1-M5 are present and selected from the group consisting of Fe, Mn, V, Nb and W.

14. The method of claim 9 , wherein the oxygen storage component has an absolute oxygen storage capacity of at least 8000 μg O 2 /mmol oxygen storage component.

Assignees

• Umicore Ag & Co Kg

Inventors

• Hofmann Alexander
• Jongen Liesbet
• Herein Daniel

Classifications

• B01J23/6484

  Niobium · CPC title

• B01D2255/20738

  Iron · CPC title

• B01J23/898 Primary

  with vanadium, tantalum, niobium or polonium · CPC title

• B01D2255/908

  O2-storage component incorporated in the catalyst · CPC title

• B01D2255/2073

  Manganese · CPC title