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Materials 2012, 5(2), 302-316; doi:10.3390/ma5020302
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Sorbate Transport in Carbon Molecular Sieve Membranes and FAU/EMT Intergrowth by Diffusion NMR

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1 Department of Chemical Engineering, University of Florida, Gainesville, FL 32611, USA 2 School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA 3 UOP LLC, A Honeywell Company, 25 E. Algonquin Road, Des Plaines, IL 60017-5017, USA
* Author to whom correspondence should be addressed.
Received: 19 January 2012 / Revised: 9 February 2012 / Accepted: 10 February 2012 / Published: 14 February 2012
(This article belongs to the Special Issue Diffusion in Micropores)
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Abstract

In this paper we present and discuss selected results of our recent studies of sorbate self-diffusion in microporous materials. The main focus is given to transport properties of carbon molecular sieve (CMS) membranes as well as of the intergrowth of FAU-type and EMT-type zeolites. CMS membranes show promise for applications in separations of mixtures of small gas molecules, while FAU/EMT intergrowth can be used as an active and selective cracking catalyst. For both types of applications diffusion of guest molecules in the micropore networks of these materials is expected to play an important role. Diffusion studies were performed by a pulsed field gradient (PFG) NMR technique that combines advantages of high field (17.6 T) NMR and high magnetic field gradients (up to 30 T/m). This technique has been recently introduced at the University of Florida in collaboration with the National Magnet Lab. In addition to a more conventional proton PFG NMR, also carbon-13 PFG NMR was used.
Keywords: carbon molecular sieve; zeolite; FAU/EMT intergrowth; diffusion; NMR carbon molecular sieve; zeolite; FAU/EMT intergrowth; diffusion; NMR
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Mueller, R.; Kanungo, R.; Menjoge, A.; Kiyono-Shimobe, M.; Koros, W.J.; Bradley, S.A.; Galloway, D.B.; Low, J.J.; Prabhakar, S.; Vasenkov, S. Sorbate Transport in Carbon Molecular Sieve Membranes and FAU/EMT Intergrowth by Diffusion NMR. Materials 2012, 5, 302-316.

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