Claims
- 1. A mixed electronic- and ionic-conducting metal oxide represented by the formula:
- 2. The metal oxide of claim 1 wherein B is Ga or Al.
- 3. The metal oxide of claim 2 wherein y is about 0.3 to about 0.9.
- 4. The metal oxide of claim 3 wherein y is about 0.5 to about 0.8.
- 5. The metal oxide of claim 4 wherein y is 0.6.
- 6. The metal oxide of claim 1 wherein y is 0.6.
- 7. The metal oxide of claim 1 wherein A is La and A′ is Sr.
- 8. The metal oxide of claim 7 wherein B″ is Co.
- 9. The metal oxide of claim 7 wherein B″ is Mg.
- 10. The metal oxide of claim 1 wherein B″ is Co.
- 11. The metal oxide of claim 10 wherein 1.4≦y+y′<2.0.
- 12. The metal oxide of claim 11 wherein 1.6≦y+y′≦1.9.
- 13. The composition of matter of claim 12 wherein A is La, A″ is Sr and x+x′ is 2.
- 14. The metal oxide of claim 1 wherein B″ is Mg.
- 15. The metal oxide of claim 14 wherein 1.5≦y+y′<2.0.
- 16. The metal oxide of claim 15 wherein 1.7≦y+y′≦1.9.
- 17. The metal oxide of claim 16 wherein A is La, A″ is Sr and x+x′ is 2.
- 18. The metal oxide of claim 1 wherein B is Ga or Al, B″ is Co and y is 0.6.
- 19. The metal oxide of claim 1 wherein B is Ga or Al, B″ is Mg and y is 0.6.
- 20. The metal oxide of claim 1 wherein A is La and A′ is Sr .
- 21. The metal oxide of claim 10 wherein x+x′ is 2.0.
- 22. The metal oxide of claim 21 wherein B is Ga or Al.
- 23. The metal oxide of claim 22 wherein y is 0.6.
- 24. The metal oxide of claim 23 wherein y+y′ ranges from about 1.7 to about 1.9.
- 25. The metal oxide of claim 1 wherein B is Ga and B″ is Mg.
- 26. The metal oxide of claim 25 wherein A is La, A″ is Sr and x+x′ is 2.
- 27. The metal oxide of claim 26 wherein y is between 0.4 and 0.6 inclusive.
- 28. The metal oxide of claim 27 wherein y′ is between 1.0 and 1.4 inclusive,
- 29. The metal oxide of claim 28 wherein y′+y is 1.8.
- 30. The metal oxide of claim 29 wherein x is 1.4 to 1.8 inclusive.
- 31. The metal oxide of claim 1 wherein B is Ga and B″ is Co.
- 32. The metal oxide of claim 31 wherein A is La, A″ is Sr and x+x′ is 2.
- 33. The metal oxide of claim 32 wherein y is between 0.4 and 0.6 inclusive.
- 34. The metal oxide of claim 33 wherein y′ is between 1.0 and 1.4 inclusive,
- 35. The metal oxide of claim 34 wherein y′+y is 1.6 to 1.8 inclusive.
- 36. The metal oxide of claim 35 wherein x is 1.4 to 1.8 inclusive.
- 37. A dense membrane for use in separation of oxygen from an oxygen-containing gas which comprises a mixed electronic-and ionic-conducting metal oxide having the formula of claim 1.
- 38. A dense membrane for use in separation of oxygen from an oxygen-containing gas wherein the membrane comprises a calcined and sintered dense ceramic consisting essentially of a mixed electronic- and ionic-conducting metal oxide having the formula of claim 1.
- 39. The dense membrane of claim 38 wherein the membrane comprises a dense thin film ranging in thickness from about 10 to about 300 microns consisting essentially of the mixed electronic- and ionic-conducting metal oxide.
- 40. A dense membrane of claim 37 wherein the electronic- and ionic-conducting oxide is selected from the group consisting of the metal oxides: La03Sr1.7Ga06Fe13Mg01O5+z; La0.3Sr17Ga0.6Fe1.2Mg02O5+z; La0.3Sr17Ga06Fe1.1Mg0.13O5+z;La0.4Sr1.6Ga0.6Fe12Mg0.2O5+z; La0.5Sr1.5Ga0.6Fe1.2Mg0.2O5+z; and La0.4Sr16Ga0.4Fe14Mg0.2O5+z
- 41. A dense membrane of claim 37 wherein the electronic- and ionic-conducting oxide is selected from the group consisting of the metal oxides: La0.4Sr16Ga06Fe1.3Co0.1O5+z; La0.4Sr1.6Ga0.6Fe1.25Co0.15O5+z; La04Sr16Ga0.6Fe1.2Co0.2O5+z; La0.4Sr1.6Ga0.6Fe1 15Co0.25O5+z; La04Sr1.6Ga0.6Fe11Co03O5+z; La0.4Sr1.6Ga06Fe1.05Co0.35O5+z; La0.3Sr1.7Ga06Fe1.3Co01O5+z; La0.3Sr17Ga06Fe12Co02O5+z;La0.3Sr17Ga06Fe1 15Co0.25O5+z; La0.3Sr17Ga06Fe1.1Co0.3O5+z; and La0.3Sr17Ga0.6Fe1 05Co0.35O5+z.
- 42. A catalytic reactor for the separation of oxygen from an oxygen-containing gas which comprises an oxidation zone and a reduction zone separated from each other by a substantially gas-impermeable membrane having an oxidation surface in contact with said oxidation zone and a reduction surface in contact with said reduction zone wherein said oxygen-containing gas is introduced into said reduction zone, oxygen is reduced at said reduction surface generating oxygen anion, oxygen anion is transported through said membrane and oxygen anion is oxidized at said oxidation surface generating oxygen in said oxidation zone and electrons in said membrane which are transported to said reduction surface thereby effecting separation of oxygen from said oxygen-containing gas and wherein said membrane is made from a mixed metal oxide having the formula:
- 43. The reactor of claim 42 wherein in said mixed metal oxide A is La, A′ is Sr, B′ is Fe, B″ is Co and x+x′ is 2.
- 44. The reactor of claim 42 wherein in said mixed metal oxide A is La, A′ is Sr, B′ is Fe and B″ is Mg and x+x′ is 2.
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application is a continuation-in-part and a divisional of U.S. patent application Ser. No. 09/ 286,829, filed Apr.6, 1999 which will issue as U.S. Pat. No. 6,165,431 on Dec. 26, 2000. The parent application is in turn a continuation-in-part of U.S. patent application Ser. No. 08/639,781, filed Apr. 29, 1996, now U.S. Pat. No. 6,033,632 which in turn is a continuation-in-part application of U.S. patent application Ser. No. 08/163,620 filed Dec. 8, 1993, now abandoned. Each of these patent applications are incorporated by reference herein in its entirety to the extent that the application is not inconsistent with the specific disclosure herein.
STATEMENT OF GOVERNMENT SUPPORT
[0002] The research for this invention was supported by a grant from the U.S. Department of Energy, Grant No. DE-FG03-96ER82215. The United States government may have certain rights in this invention.
Continuation in Parts (3)
|
Number |
Date |
Country |
Parent |
09286829 |
Apr 1999 |
US |
Child |
09748344 |
Dec 2000 |
US |
Parent |
08639781 |
Apr 1996 |
US |
Child |
09286829 |
Apr 1999 |
US |
Parent |
08163620 |
Dec 1993 |
US |
Child |
08639781 |
Apr 1996 |
US |