Sorbate Transport in Carbon Molecular Sieve Membranes and FAU/EMT Intergrowth by Diffusion NMR

Materials

Robert Mueller²  Rohit Kanungo²  Amrish Menjoge²  Mayumi Kiyono-Shimobe³  William J. Koros³  Steven A. Bradley¹  Douglas B. Galloway¹  John J. Low¹  Sesh Prabhakar¹ 

[1] UOP LLC, A Honeywell Company, 25 E. Algonquin Road, Des Plaines, IL 60017-5017, USA; E-Mails:;Department of Chemical Engineering, University of Florida, Gainesville, FL 32611, USA; E-Mails:;School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA; E-Mails:

关键词: carbon molecular sieve;    zeolite;    FAU/EMT intergrowth;    diffusion;    NMR;   

DOI  :  10.3390/ma5020302

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2012 by the authors; licensee MDPI, Basel, Switzerland.