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Preparation and Characterization of Microporous Sol-Gel Derived Ceramic Membranes for GAS Separation Applications

Published online by Cambridge University Press:  25 February 2011

R. S. A. De Lange ,
J. H. A. Hekkink ,
K. Keizer  and
A. J. Burggraaf
R. S. A. De Lange
Affiliation:
University of Twente, Faculty of Chemical Technology, Laboratory of Inorganic Chemistry, Materials Science and Catalysis, P.O. Box 217, 7500 AE Enschede, The Netherlands
J. H. A. Hekkink
Affiliation:
University of Twente, Faculty of Chemical Technology, Laboratory of Inorganic Chemistry, Materials Science and Catalysis, P.O. Box 217, 7500 AE Enschede, The Netherlands
K. Keizer
Affiliation:
University of Twente, Faculty of Chemical Technology, Laboratory of Inorganic Chemistry, Materials Science and Catalysis, P.O. Box 217, 7500 AE Enschede, The Netherlands
A. J. Burggraaf
Affiliation:
University of Twente, Faculty of Chemical Technology, Laboratory of Inorganic Chemistry, Materials Science and Catalysis, P.O. Box 217, 7500 AE Enschede, The Netherlands
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Abstract

Mesoporous alumina membranes were modified with microporous silica. The polymeric silica sols consist of very weakly branched polymeric molecules with a fractal dimension of 1.3 and Guinier radius of ≈ 2.0 nm. The resulting top layer material is microporous with a porosity of 40% and a layer thickness of 60 nm. Gas transport is activated with an activation energy of 11 kJ/mol for hydrogen and molecular sieve like separation factors have been obtained. From the mechanism of gas transport the conclusion can be drawn that the pores are of molecular dimensions (0.7 – 1 nm diameter).

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Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 271: Symposium N – Better Ceramics Through Chemistry V , 1992 , 505
Copyright
Copyright © Materials Research Society 1992

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References

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