OXYGEN EXCESS TYPE METAL OXIDE, CERAMIC FOR OXYGEN STORAGE AND/OR AN OXYGEN SELECTIVE MEMBRANE, AND METHODS AND APPARATUSES USING SAID METAL OXIDE

• US 20090206297A1
• Filed: 06/29/2006
• Published: 08/20/2009
• Est. Priority Date: 06/30/2005
• Status: Abandoned Application

• Current Assignee: Tokyo Institute of Technology (National University Corporation Tokyo Institute of Technology)
• Original Assignee: Tokyo Institute of Technology (National University Corporation Tokyo Institute of Technology)
• Inventors: Fjellvag, Helmer, Motohashi, Teruki, Karppinen, Maarit, Yamauchi, Hisao
• Application Number:
  US11/994,264
• Publication Number:
  US 20090206297A1
• Time in Patent Office: Days
• US Class Current: 252/71
• CPC Class Codes: B01D 2323/12 Specific ratios of components used
• CPC Class Codes: B01D 71/024 Oxides
• CPC Class Codes: B01J 20/0207 Compounds of Sc, Y or Lanthanides
• CPC Class Codes: B01J 20/0225 Compounds of Fe, Ru, Os, Co, Rh, Ir, Ni, Pd, Pt
• CPC Class Codes: B01J 20/0229 Compounds of Fe
• CPC Class Codes: B01J 20/0244 Compounds of Zn
• CPC Class Codes: B01J 20/041 Oxides or hydroxides
• CPC Class Codes: B01J 20/06 comprising oxides or hydroxides of metals not provided for in group B01J20/04
• CPC Class Codes: B01J 20/08 comprising aluminium oxide or hydroxide; comprising bauxite
• CPC Class Codes: B01J 20/28033 Membrane, sheet, cloth, pad, lamellar or mat
• CPC Class Codes: B01J 20/3078 Thermal treatment, e.g. calcining or pyrolizing
• CPC Class Codes: B01J 2220/42 Materials comprising a mixture of inorganic materials materials coated or impregnated on a carrier B01J20/32
• CPC Class Codes: C01B 13/0255 characterised by the type of membrane
• CPC Class Codes: C01B 13/0262 characterised by the adsorbent
• CPC Class Codes: C01B 13/0281 in getters
• CPC Class Codes: C01G 1/02 Oxides
• CPC Class Codes: C01G 49/0018 Mixed oxides or hydroxides, C01G49/0009 takes precedence
• CPC Class Codes: C01G 51/006 Compounds containing, besides cobalt, two or more other elements, with the exception of oxygen or hydrogen cobaltates C01G51/40
• CPC Class Codes: C01G 51/68 containing rare earth, e.g. La0.3Sr0.7CoO3
• CPC Class Codes: C01P 2002/72 by d-values or two theta-values, e.g. as X-ray diagram
• CPC Class Codes: C01P 2002/77 : by unit-cell parameters, atom positions or structure diagrams
• CPC Class Codes: C01P 2002/78 : by stacking-plane distances or stacking sequences
• CPC Class Codes: C04B 2235/3215 : Barium oxides or oxide-forming salts thereof
• CPC Class Codes: C04B 2235/3225 : Yttrium oxide or oxide-forming salts thereof
• CPC Class Codes: C04B 2235/3277 : Co3O4
• CPC Class Codes: C04B 2235/449 : Organic acids, e.g. EDTA, citrate, acetate, oxalate
• CPC Class Codes: C04B 2235/6562 : Heating rate
• CPC Class Codes: C04B 2235/6567 : Treatment time
• CPC Class Codes: C04B 2235/76 : Crystal structural characteristics, e.g. symmetry
• CPC Class Codes: C04B 2235/761 : Unit-cell parameters, e.g. lattice constants
• CPC Class Codes: C04B 2235/81 : Materials characterised by the absence of phases other than the main phase, i.e. single phase materials
• CPC Class Codes: C04B 35/01 : based on oxide ceramics

Abstract

An oxygen excess type metal oxide expressed with the following formula (1) and exhibiting high speed reversible oxygen diffusibility whereby a large amount of excess oxygen is diffused at a high speed and reversibly in a low temperature region:

A_jB_kC_mD_nO_7+δ  (1)

• • where
  • A: one or more trivalent rare earth ions and Ca
  • B: one or more alkaline earth metals
  • C, D: one or more oxygen tetra-coordinated cations among which at least one is a transition metal,
  • where j>0, k>0, and, independently, m≧0, n≧0, and j+k+m+n=6, and 0<δ≦1.5.

Claims

1. An oxygen excess type metal oxide expressed with the following formula (1) and having a high speed, reversible oxygen diffusibility by which a large amount of excess oxygen diffuses at a high speed and reversibly in a low temperature region:

A_jB_kC_mD_nO_7+δ

 

 

(1)

where

A;

one or more trivalent rare earth ions and Ca

B;

one or more alkaline earth metals

C, D;

one or more oxygen tetra-coordinated cations, at least one of which is a transition metal element,

where, j>

0, k>

0, and, independently, m≧

0, n≧

0, and j+k+m+n=6, and 0<

δ

≦

1.5

2. An oxygen excess type metal oxide as set forth in claim 1 characteristic in that said j, k, m, and n satisfy the followings:

j=1, k=1, 0≦

m≦

4, and 0≦

n≦

4 and m+n=4.

3. An oxygen excess type metal oxide as set forth in claim 1 characteristic in that said trivalent rare earth element is Y.

4. An oxygen excess type metal oxide as set forth in claim 1 characteristic in that said alkaline earth metal element is Ba or Sr.

5. An oxygen excess type metal oxide as set forth in claim 1 characteristic in that said oxygen tetra-coordinated cation is Co, Fe, Zn or Al.

6. An oxygen excess type metal oxide as set forth in claim 5 characteristic in that said oxygen tetra-coordinated element is Co.

7. An oxygen excess type metal oxide as set forth in claim 1 characteristic in that said low temperature region is that of 500°

C. or lower.

8. An oxygen excess type metal oxide as set forth in claim 1 characteristic in that said low temperature region is that of 200 to 400°

C.

17. An oxygen storing, separating, and/or concentrating method using an oxygen excess type metal oxide as set forth in claim 1, said oxygen storage, separating, and concentrating method characteristic in storing, separating, and/or concentrating oxygen in a low temperature region of 200 to 400°

C. and in a range of the amount of change of oxygen of over 0 to 21.4% with respect to the total molar amount of oxygen in said metal oxide.

18. An oxygen storage, separation, and concentration apparatus characteristic in being provided with an oxygen excess type metal oxide as set forth in claim 1 and in storing, separating, and/or concentrating oxygen.

19. An oxidation reaction apparatus characteristic in being provided with an oxygen excess type metal oxide as set forth in claim 1 and using the stored oxygen for an oxidation reaction.

20. An oxygen enrichment apparatus characteristic in being provided with an oxygen excess type metal oxide as set forth in claim 1 and enriching oxygen using the stored oxygen.

21. A heating apparatus characteristic in being provided with an oxygen excess type metal oxide as set forth in claim 1 and warming using the heat generated by the storage, separation, and/or concentration of oxygen.

22. A cooling apparatus characteristic in being provided with an oxygen excess type metal oxide as set forth in claim 1 and cooling using heat-absorption through the storage, separation, and/or concentration of oxygen.

23. A heat exchange apparatus characteristic in being provided with an oxygen excess type metal oxide as set forth in claim 1 and using generation and/or absorption of heat by the storage, separation, and/or concentration of oxygen for heat exchange.

9. A ceramic for oxygen storage and/or an oxygen selective membrane characteristic in that it comprises an oxygen excess type metal oxide expressed by the following formula (1) and having a high speed reversible oxygen diffusibility by which a large amount of excess oxygen diffuses at a high speed and reversibly in a low temperature region:

A_jB_kC_mD_nO_7+δ

 

 

(1)

where

A;

one or more trivalent rare earth ions and Ca

B;

one or more alkaline earth metals

C, D;

one or more oxygen tetra-coordinated cations, at least one of which is a transition metal,

where, j>

0, k>

0, and, independently, m≧

0, n≧

0, and j+k+m+n=6, and 0<

δ

≦

1.5

10. A ceramic for oxygen storage and/or oxygen selective membrane as set forth in claim 9 characteristic in that said j, k, m, and n satisfy the followings:

j=1, k=1, 0≦

m≦

4, and 0≦

n≦

4 and m+n=4.

11. A ceramic for oxygen storage and/or oxygen selective membrane as set forth in claim 9 characteristic in that said trivalent rare earth element is Y.

12. A ceramic for oxygen storage and/or oxygen selective membrane as set forth in claim 9 characteristic in that said alkaline earth metal element is Ba or Sr.

13. A ceramic for oxygen storage and/or oxygen selective membrane as set forth in claim 9 characteristic in that said oxygen tetra-coordinated element is Co, Fe, Zn or Al.

14. A ceramic for oxygen storage and/or oxygen selective membrane as set forth in claim 13 characteristic in that said oxygen tetra-coordinated element is Co.

15. A ceramic for oxygen storage and/or oxygen selective membrane as set forth in claim 9 characteristic in that said low temperature region is that of 500°

C. or lower.

16. A ceramic for oxygen storage and/or oxygen selective membrane as set forth in claim 9 characteristic in that said low temperature region is that of 200 to 400°

C.