Affiliation:
1. Laboratory for Inorganic Materials Science, Faculty of Chemical Technology, University of Twente, Post Office Box 217, 7500 AE Enschede, Netherlands.
Abstract
Process improvements in silica membrane fabrication, especially the use of clean-room techniques, resulted in silica membranes without detectable mesoscopic defects, resulting in significantly improved transport properties. Supported membranes calcined at 400°C were 30 nanometers in thickness, showed a H
2
permeance at 200°C of 2 × 10
−6
moles per square meter per second per Pascal (mol m
−2
s
−1
Pa
−1
), and had a CH
4
permeance more than 500 times smaller. Molecules larger than CH
4
were completely blocked. Silica membranes calcined at 600°C showed no detectable CH
4
flux, with a H
2
permeance of 5 × 10
−7
(mol m
−2
s
−1
Pa
−1
) at 200°C. These results signify an important step toward the industrial application of these membranes such as purification of H
2
and natural gas as well as the selective removal of CO
2
.
Publisher
American Association for the Advancement of Science (AAAS)
Reference15 articles.
1. D. E. Fain in Proceedings of the Third International Conference on Inorganic Membranes 10 to 14 July 1994 Worcester MA (1995) pp. 365-379
2. A. J. Burggraaf and L. Cot in Fundamentals of Inorganic Membrane Science and Technology vol. 4 of Membrane Science and Technology Series A. J. Burggraaf and L. Cot Eds. (Elsevier Amsterdam 1996) chap. 1.
3. The alumina powder was type CR-6 Baikowski Chimie Annecy France. Granulation was done at Philips Lighting Uden Netherlands in a dedicated spray-drying production facility.
4. R. J. R. Uhlhorn M. H. B. J. Huis In't Veld K. Keizer A. J. Burggraaf J. Mater. Sci. 27 527 (1992).
5. The TEOS was P.a. grade (Aldrich).
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