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Temporary carbon barriers in the preparation of H_2-permselective silica membranes

Jiang, S. and Yan, Y. and Gavalas, G. R. (1995) Temporary carbon barriers in the preparation of H_2-permselective silica membranes. Journal of Membrane Science, 103 (3). pp. 211-218. ISSN 0376-7388. doi:10.1016/0376-7388(95)00004-V.

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Temporary carbon barriers were used to prepare hydrogen-permselective membranes by chemical vapor deposition (CVD) of silica on porous Vycor support tubes. The carbon barriers were introduced into the pores of the support by vapor deposition polymerization of furfuryl alcohol, catalyzed by p-toluene sulfonic acid. After polymerization and crosslinking the polymer was carbonized by slow heating to 600°C and CVD of silica was carried out at 600°C by alternating flows of SiCl_4 and H_2O. During CVD the carbon residue inside the pores limits the penetration of SiCl_4 resulting in a thinner deposit layer. After CVD the carbon was removed by oxidation. The hydrogen permeance of the deposit layer obtained using the carbon barriers was 2–4 times higher than the permeance achieved without the use of carbon barriers. Thermogravimetric experiments were carried out to obtain information about the amount and spatial distribution of the carbon within the porous support.

Item Type:Article
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Gavalas, G. R.0000-0003-1468-6835
Alternate Title:Temporary carbon barriers in the preparation of H2-permselective silica membranes
Additional Information:© 1995 Elsevier. Received 19 September 1994; revised 2 December 1994; accepted 19 December 1994. This work was funded by the Gates Foundation and by the Petroleum Research Fund of ACS.
Funding AgencyGrant Number
Gates FoundationUNSPECIFIED
American Chemical Society Petroleum Research FundUNSPECIFIED
Subject Keywords:Silica membranes; H_2 permselectivity; Carbon barriers; Preparation
Issue or Number:3
Record Number:CaltechAUTHORS:20151007-090426154
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Official Citation:S. Jiang, Y. Yan, G.R. Gavalas, Temporary carbon barriers in the preparation of H2-permselective silica membranes, Journal of Membrane Science, Volume 103, Issue 3, 31 July 1995, Pages 211-218, ISSN 0376-7388, (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:60846
Deposited By: George Porter
Deposited On:13 Oct 2015 21:38
Last Modified:10 Nov 2021 22:40

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