IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0567167
(2009-09-25)
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등록번호 |
US-8246719
(2012-08-21)
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발명자
/ 주소 |
- Carolan, Michael Francis
- Bernhart, John Charles
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출원인 / 주소 |
- Air Products and Chemicals, Inc.
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대리인 / 주소 |
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인용정보 |
피인용 횟수 :
3 인용 특허 :
4 |
초록
▼
Method for processing an article comprising mixed conducting metal oxide material. The method comprises contacting the article with an oxygen-containing gas and either reducing the temperature of the oxygen-containing gas during a cooling period or increasing the temperature of the oxygen-containing
Method for processing an article comprising mixed conducting metal oxide material. The method comprises contacting the article with an oxygen-containing gas and either reducing the temperature of the oxygen-containing gas during a cooling period or increasing the temperature of the oxygen-containing gas during a heating period; during the cooling period, reducing the oxygen activity in the oxygen-containing gas during at least a portion of the cooling period and increasing the rate at which the temperature of the oxygen-containing gas is reduced during at least a portion of the cooling period; and during the heating period, increasing the oxygen activity in the oxygen-containing gas during at least a portion of the heating period and decreasing the rate at which the temperature of the oxygen-containing gas is increased during at least a portion of the heating period.
대표청구항
▼
1. A method for processing an article comprising a mixed conducting metal oxide material, which method comprises (a) contacting the article with an oxygen-containing gas and reducing the temperature of the oxygen-containing gas during a cooling period; and(b) during the cooling period, reducing the
1. A method for processing an article comprising a mixed conducting metal oxide material, which method comprises (a) contacting the article with an oxygen-containing gas and reducing the temperature of the oxygen-containing gas during a cooling period; and(b) during the cooling period, reducing the oxygen activity in the oxygen-containing gas during at least a portion of the cooling period and increasing the rate at which the temperature of the oxygen-containing gas is reduced during at least a portion of the cooling period. 2. The method of claim 1 wherein the article has a stoichiometric composition, the article is cooled, and wherein the oxygen activity in the oxygen-containing gas is reduced while cooling the oxygen-containing gas so that the oxygen activity is substantially in chemical equilibrium with the stoichiometric composition of the mixed conducting metal oxide material during at least a portion of the cooling period. 3. The method of claim 1 further comprising contacting the article with the oxygen-containing gas and increasing the temperature of the oxygen-containing gas during a heating period, wherein the article has a stoichiometric composition, the article is heated, and the oxygen activity in the oxygen-containing gas is increased during heating so that the oxygen activity is substantially in chemical equilibrium with the stoichiometric composition of the mixed conducting metal oxide material during at least a portion of the heating period, and the rate at which the temperature of the oxygen-containing gas is increased is reduced during at least a portion of the heating period. 4. The method of claim 1 wherein the oxygen-containing gas comprises a diluent and wherein the oxygen activity in the oxygen-containing gas is changed by changing concentration of the diluent therein. 5. The method of claim 1 wherein the oxygen activity in the oxygen-containing gas is changed by changing the total pressure of the oxygen-containing gas. 6. The method of claim 1 wherein the oxygen-containing gas comprises one or more components selected from the group consisting of oxygen, nitrogen, nitric oxide, nitrous oxide, carbon monoxide, carbon dioxide, and water. 7. The method of claim 4 wherein the diluent comprises one or more components selected from the group consisting of nitrogen, argon, helium, water, carbon dioxide, and mixtures thereof and wherein the diluent contains between 0.1 ppmv and 5000 ppmv of oxygen. 8. The method of claim 4 wherein the oxygen-containing gas comprises dioxygen (O2) and nitrogen. 9. A method of operating an ion transport membrane system comprising (a) providing at least one membrane module comprising a membrane made of mixed conducting metal oxide material;(b) contacting the membrane with a heated oxygen-containing gas comprising dioxygen (O2) while the temperature of the membrane is reduced during a cooling period; and(c) when the temperature of the membrane is reduced, reducing the oxygen partial pressure in the oxygen-containing gas and increasing the rate at which the temperature of the oxygen-containing gas is reduced during at least a portion of the cooling period. 10. The method of claim 9 wherein the membrane has a stoichiometric composition, the membrane is cooled, the oxygen partial pressure in the oxygen-containing gas is reduced while cooling the membrane so that the oxygen partial pressure is substantially in chemical equilibrium with the stoichiometric composition of the membrane during at least a portion of the cooling period. 11. The method of claim 9 further comprising contacting the membrane with a heated oxygen-containing as comprising dioxygen (O2) while the temperature of the membrane is increased during a heating period, wherein the membrane has a stoichiometric composition, the membrane is heated, the oxygen partial pressure in the oxygen-containing gas is increased while heating the membrane so that the oxygen partial pressure is substantially in chemical equilibrium with the stoichiometric composition of the membrane during at least a portion of the heating period, and the rate at which the temperature of the oxygen-containing gas is increased is decreased during at least a portion of the heating period. 12. The method of claim 9 wherein the oxygen partial pressure in the oxygen-containing gas in contact with the membrane is changed by mixing a diluent gas with the oxygen-containing gas. 13. The method of claim 9 wherein the oxygen partial pressure in the oxygen-containing gas in contact with the membrane is changed by changing the total pressure of the oxygen-containing gas. 14. The method of claim 9 wherein the heated oxygen-containing gas is provided by the direct combustion of an oxidant gas comprising dioxygen (O2) with a fuel. 15. An ion transport membrane system comprising (a) at least one membrane module having a membrane comprising mixed conducting metal oxide material;(b) a gas flow control system adapted to contact the membrane with a heated oxygen-containing gas and a temperature control system adapted to reduce the temperature of the oxygen-containing gas during a cooling period at any rate of temperature reduction, wherein the gas flow control system and the temperature control system are adapted to operate in combination such that; during the cooling period, the oxygen partial pressure in the oxygen-containing gas is reduced during at least a portion of the cooling period and the rate of reducing temperature of the oxygen-containing gas is increased during at least a portion of the cooling period. 16. The system of claim 15 wherein the mixed conducting metal oxide material has the general stoichiometric composition (Ln1-xAx)w(B1-yB′y)O3-δ, wherein Ln represents one or more elements selected from La, the D block lanthanides of the IUPAC periodic table, and Y; wherein A represents one or more elements selected from Mg, Ca, Sr and Ba; wherein B and B′ each represent one or more elements selected from Sc, Ti, V, Mn, Fe, Co, Ni, Cu, Cr, Al, Zr and Ga; wherein 0≦x≦1, 0≦y≦1, and 0.95x>0.5, 1.1≧w≧1.0, and δ is a number which renders the composition charge neutral. 18. The system of claim 16 wherein the mixed conducting metal oxide material has the general stoichiometric composition (LaxSr1-x)wCoO3-δ wherein 1.0>x>0.1, 1.05≧w>0.95, and δ is a number which renders the composition charge neutral. 19. The system of claim 18 wherein the mixed conducting metal oxide material has the general stoichiometric composition (La0.4Sr0.6)wCoO3-δ wherein 1.05≧w>0.95 and δ is a number which renders the composition charge neutral. 20. The system of claim 15 which further comprises a combustor for combusting an oxidant gas comprising dioxygen (O2) with a fuel to generate a combustion product that provides the heated oxygen-containing gas. 21. The system of claim 15 wherein the temperature control system is also adapted to increase the temperature of the oxygen-containing gas during a heating period at any rate of temperature increase, and wherein the gas flow control system and the temperature control system are adapted to operate in combination such that; during the heating period, the oxygen partial pressure in the oxygen-containing gas is increased during at least a portion of the heating period and the rate of increasing temperature of the oxygen-containing gas is decreased during at least a portion of the heating period.
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