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12CaO·7A12O3 compound and method for preparation thereof achieved

Foreign code F110005314
File No. E06006US
Posted date Aug 31, 2011
Country United States of America
Application number 49293802
Gazette No. 20050053546
Gazette No. 7235225
Date of filing Oct 17, 2002
Gazette Date Mar 10, 2005
Gazette Date Jun 26, 2007
International application number JP2002010806
International publication number WO2003033406
Date of international filing Oct 17, 2002
Date of international publication Apr 24, 2003
Priority data
  • P2001-321251 (Oct 18, 2001) JP
  • 2002WO-JP10806 (Oct 17, 2002) WO
Title 12CaO·7A12O3 compound and method for preparation thereof achieved
Abstract (US7235225)
There is provided a C12A7 compound capable of selectively and reversibly clathrating X- ions, such as active oxygen radicals, with improved controllability.
The C12A7 compound clathrating OH- ions and On- at a concentration of 2x1019 cm-3 or less can be prepared by subjecting a mixed material containing Ca and Al to a solid phase reaction at a firing temperature not lower than 1200° C. and lower than 1449° C. in a dry oxygen atmosphere having an oxygen partial pressure of 0.1 atm or more and a water vapor partial pressure of 10-3 atm or less, keeping the resultant product at a temperature of 1200° C. or higher, and cooling rapidly.
The C12A7 compound is heat-treated to clathrate OH- ions at a concentration of 2x1019 cm-3 or less, and On- at a high concentration of more than 2x1019 cm-3.
The compound can reversibly clathrate or release On- ion radicals through the elevation or lowering of the temperature thereof in a temperature range of 300 to 850° C.
The compound is useful for an oxidation catalyst, an anti-bacterial agent, an ion conducting material, an electrode for a solid-electrolyte fuel cell, and the like.
Scope of claims [claim1]
1. A 12CaO.7Al2O3 compound clathrating OH- ions at a concentration of 2 * 1019 cm-3 or less, and On- ion radicals at a high concentration of more than 2 * 1019 cm-3.
[claim2]
2. A method for preparing the 12CaO.7Al2O3 compound clathrating OH- ions at a concentration of 2 * 1019 cm-3 or less, and On- ion radicals at a high concentration of more than 2 * 1019 cm-3, comprising the steps of: subjecting a mixed material containing calcium (Ca) and aluminum (Al) to a solid phase reaction as a firing temperature not lower than 1200 deg. C. and lower than 1449 deg. C. in a dry oxygen atmosphere having an oxygen partial pressure of 10-2 MPa or more and a water vapor partial pressure of 10-4 MPa or less, andslowly cooling the resultant product to a temperature in the range of 300 to 800 deg. C., whereby the compound is provided.
[claim3]
3. A method for preparing the 12CaO.7Al2O3 compound clathrating OH- ions at a concentration of 2 * 1019 cm-3 or less, and On- ion radicals at a high concentration of more than 2 * 1019 cm-3, wherein the 12CaO.7Al2O3 compound including minus monovalent ion represented by X- and ion molecules at a concentration of 2 * 1019 cm-3 or less is kept at a fixed temperature in a temperature range of 300 to 800 deg. C. in a dry oxygen atmosphere having an oxygen partial pressure of 10-2 MPa or more and a water vapor partial pressure of 10-4 MPa or less, and is cooled rapidly or slowly to room temperature.
[claim4]
4. A method for reversibly clathrating or releasing On- ion radicals of 12CaO.7Al2O3 compound, comprising: elevating or lowering temperature of the 12CaO.7Al2O3 compound in a temperature range of 300 to 800 deg. C. in a dry oxygen atmosphere having an oxygen partial pressure of 0.1 atm or more and a water vapor partial pressure of 10-3 atm or less.
[claim5]
5. A method for preparing the 12CaO.7Al2O3 compound according to claim 2, wherein calcium carbonate, calcium hydroxide, or calcium oxide is used as a raw material for the calcium, and aluminum oxide or aluminum hydroxide is used as a raw material for the aluminum.
  • Inventor, and Inventor/Applicant
  • HOSONO HIDEO
  • HIRANO MASAHIRO
  • HAYASHI KATSURO
  • JAPAN SCIENCE AND TECHNOLOGY AGENCY
IPC(International Patent Classification)
Reference ( R and D project ) ERATO HOSONO Transparent ElectroActive Materials AREA
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