Tsapatsis, Michael and Kim, Soojin and Nam, Suk Woo and Gavalas, George (1991) Synthesis of hydrogen permselective silicon dioxide, titanium dioxide, aluminum oxide, and boron oxide membranes from the chloride precursors. Industrial & Engineering Chemistry Research, 30 (9). pp. 2152-2159. ISSN 0888-5885. doi:10.1021/ie00057a015. https://resolver.caltech.edu/CaltechAUTHORS:20151008-112329165
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Abstract
Hydrogen-permselective membranes were synthesized by chemical vapor deposition of SiO_2, TiO_2, Al_2O_3, and B_2O_3 layers within the pores of Vycor tubes. The deposition involved reaction of SiCl_4, etc., with water at 100-800 °C depending on the chloride and the reaction geometry. Permselective SiO_2 layers could be formed in either the one-sided or the two-sided (opposing reactants) geometry, while deposition of TiO_2 and Al_2O_3 layers was achieved only in the two-sided geometry. The permeation coefficients at 450 °C were 0.3 and 0.1 cm^3/(cm^2•min•atm) for SiO_2 membranes produced in the one-sided and two-sided geometries, respectively. The H_2:N_2 permeation ratios were 1000-5000. The TiO_2 and Al_2O_3 membranes had somewhat lower permeation coefficients and H_2:N_2 ratios. The membranes were characterized by scanning electron microscopy (SEM) and electron microprobe analysis (EMA). A reaction mechanism is suggested involving heterogeneous reactions of chloride and water molecules with hydroxyl and chloride groups in the growing deposit layer.
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Additional Information: | © 1991 American Chemical Society. Received for review January 29, 1991. Accepted June 10, 1991. Funding by the Department of Energy with UCR Grant DE-FG22-89PC89765 and Contract DE-AC21-90MC26365 is gratefully acknowledged. | |||||||||
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Issue or Number: | 9 | |||||||||
DOI: | 10.1021/ie00057a015 | |||||||||
Record Number: | CaltechAUTHORS:20151008-112329165 | |||||||||
Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20151008-112329165 | |||||||||
Official Citation: | Synthesis of hydrogen permselective silicon dioxide, titanium dioxide, aluminum oxide, and boron oxide membranes from the chloride precursors Michael Tsapatsis, Soojin Kim, Suk Woo Nam, and George Gavalas Industrial & Engineering Chemistry Research 1991 30 (9), 2152-2159 DOI: 10.1021/ie00057a015 | |||||||||
Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | |||||||||
ID Code: | 60894 | |||||||||
Collection: | CaltechAUTHORS | |||||||||
Deposited By: | George Porter | |||||||||
Deposited On: | 19 Oct 2015 17:42 | |||||||||
Last Modified: | 10 Nov 2021 22:41 |
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