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type     June, 2005

Vol 1 Chapter 20: Grace: Development of Silica Membranes for Gas Separation at Higher Temperatures

Henk Kruidhof, Mieke W.J. Luiten, Nieck E. Benes and Henny J.M. Bouwmeester

Abstract: Using a polymeric gel solution route, tubular micro-porous silica membranes showing high hydrogen permeance and high gas selectivities have been prepared. Silica membranes have been coated on top of steam-stable g-Al2O3 intermediate membranes inside a high-quality tubular support. Tube ends were coated with glass giving a gastight changeover between support and membranes. Single dead-end gas permeance measurements performed at temperatures .300 8C and 4 bar pressure difference showed hydrogen fluxes .1.1026 mol m22 s21 Pa21 while H2/CO2 permselectivity under these conditions was found to be 80–100. H2/CO2 selectivity increases up to 200 with decreasing pressure down to 1 bar. Membranes were shown to be thermally stable for at least 2000 h at temperatures between 200 and 400 8C. Preliminary water-gas-shift experiments were performed at temperatures above 250 8C and showed higher than equilibrium CO conversion.

Carbon Dioxide Capture for Storage in Deep Geologic Formations – Results from the CO2 Capture Project Capture and Separation of Carbon Dioxide from Combustion Sources - Volume 1
Edited by:
David C. Thomas, Senior Technical Advisor, Advanced Resources International Inc, USA

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