Tune the oxygen storage properties of Ca2MnAlO5+δthrough chemical doping

Patent metadata

Field	Value
Publication number	US-9573114-B2
Application number	US-201414517283-A
Country	US
Kind code	B2
Filing date	Oct 17, 2014
Priority date	Oct 17, 2014
Publication date	Feb 21, 2017
Grant date	Feb 21, 2017

Abstract

An oxygen storage material including a compound of the formula: Ca 2 MnAlO 5+δ wherein 0≦δ≦0.5 wherein the compound includes at least one dopant said dopant selected from alkaline earth ions at the Ca site, trivalent ions at the Al site, and 3 d transition metal ions at the Mn site wherein the an oxygen release temperature or an oxygen storage temperature is modified in comparison to an un-doped Ca 2 MnAlO 5+δ material.

First claim

Having described our invention, We claim:

1. An oxygen storage material comprising:
a compound of the formula: Ca 2 MnAlO 5+δ wherein 0≦δ≦0.5

wherein the compound includes at least one dopant said dopant selected from alkaline earth ions at the Ca site, trivalent ions at the Al site, and 3d transition metal ions at the Mn site wherein the an oxygen release temperature or an oxygen storage temperature is modified in comparison to an un-doped Ca 2 MnAlO 5+δ material.

2. The oxygen storage material of claim 1 wherein the dopant is present in an amount of from 6 to 13 molar percent.

3. The oxygen storage material of claim 1 wherein the alkaline earth ions are selected from Mg, Sr and Ba.

4. The oxygen storage material of claim 3 wherein the alkaline earth ion is Mg and the release temperature is increased in comparison to an un-doped Ca 2 MnAlO 5+δ material.

5. The oxygen storage material of claim 3 wherein the alkaline earth ion is Sr or Ba and the release temperature is decreased in comparison to an un-doped Ca 2 MnAlO 5+δ material.

6. The oxygen storage material of claim 1 wherein the trivalent ions are selected from Ga, Sc, and Y.

7. The oxygen storage material of claim 6 wherein the trivalent ion is Ga and the release temperature is increased in comparison to an un-doped Ca 2 MnAlO 5+δ material.

8. The oxygen storage material of claim 6 wherein the trivalent ion is Sc or Y and the release temperature is decreased in comparison to an un-doped Ca 2 MnAlO 5+δ material.

9. The oxygen storage material of claim 1 wherein the 3d transition metal ions are selected from Ti, V, Cr, Fe, Co and Ni.

10. The oxygen storage material of claim 9 wherein the 3d transition metal ion is Fe or Co or Ni and the release temperature is decreased in comparison to an un-doped Ca 2 MnAlO 5+δ material.

11. The oxygen storage material of claim 9 wherein the 3d transition metal ion is Ti or V and the release temperature is increased in comparison to an un-doped Ca 2 MnAlO 5+δ material.

12. The oxygen storage material of claim 1 wherein the at least one dopant includes two dopants.

13. The oxygen storage material of claim 12 wherein the two dopants are doped at differing sites of the Ca, Mn and Al sites.

14. An oxygen storage material comprising:
a compound of the formula: Ca 2 MnAlO 5+δ wherein 0≦δ≦0.5

wherein the compound includes at least one dopant said dopant selected from alkaline earth ions at the Ca site, trivalent ions at the Al site, and 3d transition metal ions at the Mn site wherein the an oxygen release temperature is increased in comparison to an un-doped Ca 2 MnAlO 5+δ material.

15. The oxygen storage material of claim 14 wherein the at least one dopant is selected from the group wherein the 3d transition metal ion is Ti or V, the trivalent ion is Ga, and the alkaline earth ion is Mg.

16. An oxygen storage material comprising:
a compound of the formula: Ca 2 MnAlO 5+δ wherein 0≦δ≦0.5

wherein the compound includes at least one dopant said dopant selected from alkaline earth ions at the Ca site, trivalent ions at the Al site, and 3d transition metal ions at the Mn site wherein the an oxygen release temperature is decreased in comparison to an un-doped Ca 2 MnAlO 5+δ material.

17. The oxygen storage material of claim 16 wherein the at least one dopant is selected from the group wherein the 3d transition metal ion is the 3d transition metal ion is Fe or Co or Ni, the trivalent ion is Sc or Y, and the alkaline earth ion is Sr or Ba.

18. An oxygen storage material comprising:
a compound of the formula: Ca 2 MnAlO 5+δ wherein 0≦δ≦0.5

wherein the compound includes two dopants said dopants selected from alkaline earth ions at the Ca site, trivalent ions at the Al site, and 3d transition metal ions at the Mn site wherein the an oxygen release temperature or an oxygen storage temperature is modified in comparison to an un-doped Ca 2 MnAlO 5+δ material.

19. The oxygen storage material of claim 18 wherein the alkaline earth ions are selected from Mg, Sr and Ba.

20. The oxygen storage material of claim 18 wherein the trivalent ions are selected from Ga, Sc, and Y.

21. The oxygen storage material of claim 18 wherein the 3d transition metal ions are selected from Ti, V, Cr, Fe, Co and Ni.

Assignees

• Toyota Motor Eng & Mfg North America Inc

Inventors

• Ling Chen
• Zhang Ruigang

Classifications

• B01J20/041 Primary

  Oxides or hydroxides · CPC title

• C01G49/009

  Compounds containing iron, with or without oxygen or hydrogen, and containing two or more other elements · CPC title

• C01B13/0203

  from inorganic compounds · CPC title

• C01G45/00

  Compounds of manganese · CPC title

• C01P2004/80

  Particles consisting of a mixture of two or more inorganic phases · CPC title