Abstract
A seeded growth method for the fabrication of high-permeance, high-separation-factor zeolite (siliceous ZSM-5, [Si 96 O 192 ]-MFI) membranes is reported. The method consists of growing the crystals of an oriented seed layer to a well-intergrown film by avoiding events that lead to a loss of preferred orientation, such as twin overgrowths and random nucleation. Organic polycations are used as zeolite crystal shape modifiers to enhance relative growth rates along the desirable out-of-plane direction. The polycrystalline films are thin (∼1 micrometer) with single grains extending along the film thickness and with large in-plane grain size (∼1 micrometer). The preferred orientation is such that straight channels with an open diameter of ∼5.5 angstroms run down the membrane thickness. Comparison with previously reported membranes shows that these microstructurally optimized films have superior performance for the separation of organic mixtures with components that have small differences in size and shape, such as xylene isomers.
Authors
11
- Zhiping Lai (first)
- Griselda Bonilla (additional)
- Isabel Diaz (additional)
- Jose Geraldo Nery (additional)
- Khristina Sujaoti (additional)
- Miguel A. Amat (additional)
- Efrosini Kokkoli (additional)
- Osamu Terasaki (additional)
- Robert W. Thompson (additional)
- Michael Tsapatsis (additional)
- Dionisios G. Vlachos (additional)
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- Funding for this work was provided by NSF (CTS-0091406 and CTS-0103010) and NASA-Microgravity (98 HEDS-05-218). I.D. acknowledges support from a Fulbright Fellowship R.W.T. thanks WPI for granting him a sabbatical leave to the University of Massachusetts and M.T. acknowledges support from a Camille Dreyfus Teacher Scholar Award and thanks E.W. Corcoran and H. Deckman of ExxonMobil Research and Development Annandale NJ for advice regarding permporosimetry.
Dates
Type | When |
---|---|
Created | 22 years, 4 months ago (April 17, 2003, 4:04 p.m.) |
Deposited | 1 year, 7 months ago (Jan. 9, 2024, 9:36 p.m.) |
Indexed | 1 day, 2 hours ago (Aug. 23, 2025, 12:59 a.m.) |
Issued | 22 years, 4 months ago (April 18, 2003) |
Published | 22 years, 4 months ago (April 18, 2003) |
Published Print | 22 years, 4 months ago (April 18, 2003) |
@article{Lai_2003, title={Microstructural Optimization of a Zeolite Membrane for Organic Vapor Separation}, volume={300}, ISSN={1095-9203}, url={http://dx.doi.org/10.1126/science.1082169}, DOI={10.1126/science.1082169}, number={5618}, journal={Science}, publisher={American Association for the Advancement of Science (AAAS)}, author={Lai, Zhiping and Bonilla, Griselda and Diaz, Isabel and Nery, Jose Geraldo and Sujaoti, Khristina and Amat, Miguel A. and Kokkoli, Efrosini and Terasaki, Osamu and Thompson, Robert W. and Tsapatsis, Michael and Vlachos, Dionisios G.}, year={2003}, month=apr, pages={456–460} }