TiO{sub 2} permselective membranes
Conference
·
OSTI ID:10133531
Hydrogen permselective membranes were synthesized by chemical vapor deposition of TiO{sub 2} or SiO{sub 2} layers within the pores of Vycor tubes used as supports. The reaction mechanism and kinetics of TiO{sub 2} or SiO{sub 2} formation were investigated in terms of the heterogeneous reactions between gaseous TiCl{sub 4} or SiCl{sub 4} with hydroxyl groups in the solid and between gaseous H{sub 2}O and chloride groups in the solid. The growth of the oxide layers can be characterized as a polymerization proceeding by alternating reactions of the gaseous reactants with groups on the solid surface. In addition, condensation reactions occur between surface chloride groups and nearby hydroxyl groups or two neighboring hydroxyl groups, that contribute to the overall mechanism of the oxide layer formation. For the case of TiO{sub 2} deposition, chlorination of the surface hydroxyl groups seems to be the rate-limiting step in the growth of the deposit layer.
- Research Organization:
- California Inst. of Tech., Pasadena, CA (United States). Div. of Chemistry and Chemical Engineering
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- FG22-89PC89765
- OSTI ID:
- 10133531
- Report Number(s):
- CONF-911133--11; ON: DE92009988
- Country of Publication:
- United States
- Language:
- English
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