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Title: Method for forming H2-permselective oxide membranes

Methods are disclosed for forming permselective oxide membranes that are highly selective to permeation of hydrogen by chemical deposition of reactants in the pore of porous tubes, such as Vycor{trademark} glass or Al{sub 2}O{sub 3} tubes. The porous tubes have pores extending through the tube wall. The process involves forming a stream containing a first reactant of the formula RX{sub n}, wherein R is silicon, titanium, boron or aluminum, X is chlorine, bromine or iodine, and n is a number which is equal to the valence of R; and forming another stream containing water vapor as the second reactant. Both of the reactant streams are passed along either the outside or the inside surface of a porous tube and the streams react in the pores of the porous tube to form a nonporous layer of R-oxide in the pores. The membranes are formed by the hydrolysis of the respective halides. In another embodiment, the first reactant stream contains a first reactant having the formula SiH{sub n}Cl{sub 4{minus}n} where n is 1, 2 or 3; and the second reactant stream contains water vapor and oxygen. In still another embodiment the first reactant stream containing a first reactant selected from the groupmore » consisting of Cl{sub 3}SiOSiCl{sub 3}, Cl{sub 3}SiOSiCl{sub 2}OSiCl{sub 3}, and mixtures thereof and the second reactant stream contains water vapor. In still another embodiment, membrane formation is carried out by an alternating flow deposition method. This involves a sequence of cycles, each cycle comprising introduction of the halide-containing stream and allowance of a specific time for reaction followed by purge and flow of the water vapor containing stream for a specific length of time. In all embodiments the nonporous layers formed are selectively permeable to hydrogen. 11 figs.« less
Inventors:
; ; ;
Issue Date:
OSTI Identifier:
106698
Assignee:
California Inst. of Tech., Pasadena, CA (United States) PTO; SCA: 080100; PA: EDB-95:134480; SN: 95001461639
Patent Number(s):
US 5,453,298/A/
Application Number:
PAN: 8-221,873
Contract Number:
FG22-92PC92525; AC21-90MC26365
Resource Relation:
Other Information: PBD: 26 Sep 1995
Research Org:
California Institute of Technology
Country of Publication:
United States
Language:
English
Subject:
08 HYDROGEN FUEL; MEMBRANES; FABRICATION; HYDROGEN; MEMBRANE TRANSPORT; TUBES; POROUS MATERIALS; SILICON HALIDES; TITANIUM COMPOUNDS; BORON COMPOUNDS; ALUMINIUM COMPOUNDS; HYDROLYSIS; SILICON CHLORIDES

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