IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
UP-0381088
(2006-05-01)
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등록번호 |
US-7585356
(2009-09-22)
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발명자
/ 주소 |
- Oyama, S. Ted
- Gu, Yungeng
|
출원인 / 주소 |
- Virginia Tech Intellectual Properties, Inc.
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대리인 / 주소 |
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인용정보 |
피인용 횟수 :
3 인용 특허 :
7 |
초록
▼
Thin layers of a mixed composition are deposited on a porous substrate by chemical vapor deposition in an inert atmosphere at high temperature. The resulting membrane has excellent stability to water vapor at high temperatures. An exemplary membrane comprises an amorphous mixed-element surface layer
Thin layers of a mixed composition are deposited on a porous substrate by chemical vapor deposition in an inert atmosphere at high temperature. The resulting membrane has excellent stability to water vapor at high temperatures. An exemplary membrane comprises an amorphous mixed-element surface layer comprising silica and at least one oxide of additional element, an optional porous substrate on which said surface layer is deposited, and a porous support on which said substrate or mixed-element surface layer is deposited, wherein the permeance of the membrane is higher than 1×10-7 mol m-2 s-1 Pa-1 and the selectivity of H2 over CO, CO2, and CH4 is larger than 100, and wherein the H2 permeance of the membrane after exposure to a stream containing 60 mol % water vapor at 673 K for 120 h is at least 50% of its initial H2 permeance.
대표청구항
▼
What is claimed is: 1. A composite membrane useful for the preferential permeation of gases, comprising: an amorphous mixed-element surface layer comprising silica and at least one oxide of an element selected from the group consisting of B, F, Al, P, Ga, Ge, As, In, Sn, Sb, Sc, Ti, V, Y, Zr, Nb, L
What is claimed is: 1. A composite membrane useful for the preferential permeation of gases, comprising: an amorphous mixed-element surface layer comprising silica and at least one oxide of an element selected from the group consisting of B, F, Al, P, Ga, Ge, As, In, Sn, Sb, Sc, Ti, V, Y, Zr, Nb, La, Hf, and Ta; optionally, a porous substrate on which said surface layer is deposited; and a porous support on which said substrate or mixed-element surface layer is deposited; wherein the permeance of the membrane is greater than 1×10-7 mol m-2 s-1 Pa-1 and the selectivity of H2 over CO, CO2, and CH4 is larger than 100; and wherein the membrane incurs a drop in permeance of less than 80% upon exposure to a stream containing 60 mol % water vapor at 673 K for 120 h. 2. The composite membrane of claim 1 wherein the membrane incurs a drop in permeance of less than 50% upon exposure to a stream containing 60 mol % water vapor at 673 K for 120 h. 3. The composite membrane of claim 1 wherein the porous substrate comprises multiple layers having different particle sizes. 4. The composite membrane of claim 1 wherein the porous substrate comprises a material selected from the group consisting of alumina, silica, titania, magnesia, zirconia, zeolites, carbon, phosphorus, gallium, germanium, yttria, niobia, lanthana, and mixtures thereof. 5. The composite membrane of claim 1 wherein the porous support comprises a material selected from the group consisting of alumina, silica, titania, magnesia, zirconia, zeolites, carbon, phosphorus, gallium, germanium, yttria, niobia, lanthana, stainless steel and combinations thereof. 6. A method for preparing a composite membrane, comprising: a) providing a porous support; b) optionally, providing a porous alumina substrate on said support; c) carrying out simultaneous deposition of mixed precursors of silica and at least one additional oxide from a mixed flow stream as to deposit an amorphous mixed-element surface layer comprising silica and at least one oxide of an element selected from the group consisting of B, F, Al, P, Ga, Ge, As, In, Sn, Sb, Sc, Ti, V, Y, Zr, Nb, La, Hi, and Ta, such that the permeance of the membrane is greater than 1×10-7 mol m-2 s-1 Pa-1, the selectivity of H2 over CO, CO2, and CH4 is greater than 100, and the membrane incurs a drop in permeance of less than 80% upon exposure to a stream containing 60 mol % water vapor at 673 K for 120 h. 7. The method of claim 6 wherein step c) is carried out such that the membrane incurs a drop in permeance of less than 50% upon exposure to a stream containing 60 mol % water vapor at 673 K for 120 h. 8. The method of claim 6 wherein step c) comprises depositing the mixed precursors by chemical vapor deposition. 9. The method of claim 6 wherein step c) comprises depositing the mixed precursors by a sol gel method. 10. The method of claim 6 wherein the mixed precursors include a precursor of silica that is decomposable by thermal means. 11. The method of claim 6 wherein at least one of the mixed precursors is selected from the group consisting of tetraethylorthosilicate (TEOS), tetramethylorthosilicate (TMOS), ethyltriethoxysilane, silane, chiorosilane, and combinations thereof. 12. The method of claim 6 wherein at least one of the mixed precursors is selected from the group consisting of aluminum tri-sec-butoxide (AISB), aluminum tributoxide, aluminum tri-tertbutoxide, aluminum triethoxide, aluminum chloride, and combinations thereof. 13. The method of claim 6 wherein at least one of the mixed precursors is selected from the group consisting of titanium isopropoxide (TIP), titanium alkoxides, titanium alkyls, titanium chloride, and combinations thereof.
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