Surface Seeding in ZSM-5 Membrane Preparation
- Creators
- Lai, Re
- Gavalas, George R.
Abstract
ZSM-5 zeolite membranes were prepared by in situ hydrothermal synthesis on macroporous α-alumina tubes coated with silicalite seeds. Seed particles were prepared by hydrothermal synthesis at 95 °C to mean size 0.4 or 2 μm, purified of unconverted reactants, and suspended in a buffered aqueous solution. The support tubes were seeded by immersion in the particle suspension under ultrasonication. Membrane growth on seeded supports was carried out at temperatures 110−150 °C and different reaction times. An external polycrystalline layer gradually grows on top of the support, with siliceous deposits accumulating as deep as 100 μm inside the pores of the support. Thermogravimetric analysis and nitrogen and argon adsorption measurements indicate graduate conversion of deposits from amorphous to crystalline. Pure gas permeation results are presented for membranes prepared using 0.4 and 2 μm seeds under different compositions and temperatures.
Additional Information
© 1998 American Chemical Society. Received for review April 27, 1998. Revised manuscript received August 18, 1998. Accepted August 21, 1998. This study was funded by NSF grant CTS 9504901 and by Chevron Research and Technology Co. Micromeritics Corp. provided a grant for the ASAP 2000 instrument.Additional details
- Eprint ID
- 60839
- DOI
- 10.1021/ie980265a
- Resolver ID
- CaltechAUTHORS:20151007-090424153
- CTS-9504901
- NSF
- Chevron Research and Technology Co.
- Micromeritics Corp.
- Created
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2015-10-13Created from EPrint's datestamp field
- Updated
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2021-11-10Created from EPrint's last_modified field