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Permeation studies on oriented single-crystal ferrierite membranes

Lewis, John E., Jr. and Gavalas, George R. and Davis, Mark E. (1997) Permeation studies on oriented single-crystal ferrierite membranes. AIChE Journal, 43 (1). pp. 83-90. ISSN 0001-1541. doi:10.1002/aic.690430111.

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Large, high-quality, single crystals of pure-silica ferrierite are synthesized, and the structure is described. Selected individual crystals (approximately 600 μm X 500 μm X 20 μm) are mounted in a membrane configuration so that only the 10-membered-ring channels (5.4 Å X 5.4 Å X 4.2 Å) or the 8-membered-ring channels (4.6 Å X 3.7 Å X 3.0 Å) are accessible for gas-molecule permeation. The first examples of transport exclusively through 8- or 10-membered-ring channel systems are reported and obtained through crystal orientation in the membrane. A series. of adsorption experiments are conducted to help select suitable probe molecules and evaluate the role of adsorption in the permeation process for single-crystal membranes. Methane, n-butane, isobutane and nitrogen probe molecules are used to study intracrystalline sorption and transport effects for different crystal orientations, pressures and temperatures. Both pure-gas selectivities and mixed-gas separation factors are reported. A mixed-gas separation factor of n-butane/isobutane = 116 for the 10-membered-ring orientation of the crystal at 383 K and a transmembrane pressure difference of 1.01 X 10^5 Pa are found using this technique. In addition, molecular sieving is observed for the 8-membered-ring orientation of the crystal since methane, but not butane, transport is observed for this crystal orientation.

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Gavalas, George R.0000-0003-1468-6835
Davis, Mark E.0000-0001-8294-1477
Additional Information:© 1997 American Institute of Chemical Engineers (AIChE). Manuscript received Apr. 24, 1996, and revision received July 12, 1996. Financial support for this work was provided by the National Science Foundation (grant no. CTS-9114829). The authors also wish to acknowledge helpful discussions with Yushan Yan.
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Official Citation:Lewis, J. E., Gavalas, G. R. and Davis, M. E. (1997), Permeation studies on oriented single-crystal ferrierite membranes. AIChE J., 43: 83–90. doi:10.1002/aic.690430111
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:60843
Deposited By: George Porter
Deposited On:13 Oct 2015 17:27
Last Modified:10 Nov 2021 22:40

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