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Sorbate Transport in Carbon Molecular Sieve Membranes and FAU/EMT Intergrowth by Diffusion NMR
Department of Chemical Engineering, University of Florida, Gainesville, FL 32611, USA
School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA
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; in revised form: 9 February 2012 / Accepted: 10 February 2012 / Published: 14 February 2012
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
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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.
Mueller R, Kanungo R, Menjoge A, Kiyono-Shimobe M, Koros WJ, Bradley SA, Galloway DB, Low JJ, Prabhakar S, Vasenkov S. Sorbate Transport in Carbon Molecular Sieve Membranes and FAU/EMT Intergrowth by Diffusion NMR. Materials. 2012; 5(2):302-316.
Mueller, Robert; Kanungo, Rohit; Menjoge, Amrish; Kiyono-Shimobe, Mayumi; Koros, William J.; Bradley, Steven A.; Galloway, Douglas B.; Low, John J.; Prabhakar, Sesh; Vasenkov, Sergey. 2012. "Sorbate Transport in Carbon Molecular Sieve Membranes and FAU/EMT Intergrowth by Diffusion NMR." Materials 5, no. 2: 302-316.