Microstructural Optimization of a Zeolite Membrane for Organic Vapor Separation

American Association for the Advancement of Science (AAAS) - Tập 300 Số 5618 - Trang 456-460 - 2003
Zhiping Lai1,2,3,4, Griselda Bonilla1,2,3,4, Isabel Dı́az1,2,3,4, José Geraldo Nery1,2,3,4, Khristina Sujaoti1,2,3,4, Miguel A. Amat1,2,3,4, Efrosini Kokkoli1,2,3,4, Osamu Terasaki1,2,3,4, Robert W. Thompson1,2,3,4, Michael Tsapatsis1,2,3,4, Dionisios G. Vlachos1,2,3,4
1Department of Chemical Engineering, University of Delaware, Newark, DE 19716, USA
2Department of Chemical Engineering, University of Massachusetts, Amherst MA 01003 USA
3Department of Chemical Engineering, Worcester Polytechnic Institute, Worcester, MA 01609, USA
4Department of Physics, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan

Tóm tắt

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.

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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.

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American Association for the Advancement of Science (AAAS)

Tập 300 Số 5618

456-460

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