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Synthesis of hydrogen permselective silicon dioxide, titanium dioxide, aluminum oxide, and boron oxide membranes from the chloride precursors

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. 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.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1021/ie00057a015DOIArticle
http://pubs.acs.org/doi/abs/10.1021/ie00057a015PublisherArticle
ORCID:
AuthorORCID
Gavalas, George0000-0003-1468-6835
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.
Funders:
Funding AgencyGrant Number
Department of Energy (DOE)DE-FG22-89PC89765
Department of Energy (DOE)DE-AC21-90MC26365
Issue or Number:9
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:03 Oct 2019 09:01

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