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Zeolite Membranes from Kaolin

Published online by Cambridge University Press:  10 February 2011

B. G. Karle ,
C. J. Brinker  and
M. L. F. Phillips
B. G. Karle
Affiliation:
Center for Micro-Engineered Ceramics, University of New Mexico, Albuquerque, NM 87131.
C. J. Brinker
Affiliation:
Center for Micro-Engineered Ceramics, University of New Mexico, Albuquerque, NM 87131. Sandia National Laboratories, Albuquerque, NM, 87185
M. L. F. Phillips
Affiliation:
Sandia National Laboratories, Albuquerque, NM, 87185
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Abstract

Zeolite films are sought as components of molecular sieve membranes. Different routes used to prepare zeolite composite membranes include growing zeolite layers from gels on porous supports, depositing oriented zeolites on supports, and dispersing zeolites in polymeric membranes. In most cases, it is very difficult to control and avoid the formation of cracks and/or pinholes. Our approach to membrane synthesis is based on hydrothermally converting films of layered aluminosilicates into zeolite films. We have demonstrated this concept by preparing zeolite A membranes on alumina supports from kaolin films. We have optimized the process parameters not only for desired bulk properties, but also for preparing thin (ca. 5 μm), continuous zeolite A films. Scanning electron microscopy shows highly intergrown zeolite A crystals over most of the surface area of the membrane, but gas permeation experiments indicate existence of mesoporous defects and/or intercrystalline gaps. It has been demonstrated that the thickness of the final zeolite A membrane can be controlled by limiting the amount of precursor kaolin present in the membrane.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 431: Symposium P – Microporous and Macroporous Materials , 1996 , 237
Copyright
Copyright © Materials Research Society 1996

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