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Internal Concentration Gradients of Guest Molecules in Nanoporous Host Materials:  Measurement and Microscopic Analysis

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Download Hi-Res ImageDownload to MS-PowerPointCite This:J. Phys. Chem. B 2006, 110, 47, 23821-23828
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    Internal Concentration Gradients of Guest Molecules in Nanoporous Host Materials:  Measurement and Microscopic Analysis
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    Fakultät für Physik und Geowissenschaften, Universität Leipzig, Linnéstr. 5, D-04103 Leipzig, Germany, Chemical Engineering Department, University of Florida, P.O. Box 116005, Gainesville, Florida 32611-6005, Chemical & Biomedical Engineering Department, Cleveland State University, 2121 Euclid Avenue, Cleveland, Ohio 44115-2214, and Institute of Chemical Technology, Universität Stuttgart, 70550 Stuttgart, Germany
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    The Journal of Physical Chemistry B

    Cite this: J. Phys. Chem. B 2006, 110, 47, 23821–23828
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    https://doi.org/10.1021/jp065112c
    Published October 18, 2006
    Copyright © 2006 American Chemical Society
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    Abstract

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    Evolution of internal concentration profiles of methanol in 2-D pore structure of ferrierite crystal was measured in the pressure range of 0 to 80 mbar with the help of the recently developed interference microscopy technique. The measured profiles showed that both a surface barrier and internal diffusion controlled the kinetics of adsorption/desorption. Furthermore, they indicated that in the main part of the crystal, the z-directional 10-ring channels were not accessible to methanol and that the transport of methanol mainly occurred via 8-ring y-directional channels. The roof-like part of the crystal was almost instantaneously filled/emptied during adsorption/desorption, indicating accessible 10-ring channels in this section. The measured profiles were analyzed microscopically with the direct application of Fick's second law, and the transport diffusivity of methanol in ferrierite was determined as a function of adsorbed phase concentration. The transport diffusivity varied by more than 2 orders of magnitude over the investigated pressure range. Transport diffusivities, calculated from measured profiles from small and large pressure step changes, were all found to be consistent. Simulated concentration profiles obtained from the solution of Fick's second law with the calculated functional dependence of diffusivities on concentration compared very well with the measured concentration profiles, indicating validity and consistency of the measured data and the calculated diffusivities. The results indicate the importance of measuring the evolution of concentration profiles as this information is vital in determining (1) the direction of internal transport, (2) the presence of internal structural defects, and (3) surface/internal transport barriers. Such detailed information is available neither from common macroscopic methods since, they measure changes in macroscopic properties and use model assumptions to predict the concentration profiles inside, nor from microscopic methods, since they only provide information on average displacement of diffusing molecules.

    Copyright © 2006 American Chemical Society

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    †

     Universität Leipzig.

    *

     Corresponding author. E-mail address:  [email protected].

    ‡

     University of Florida.

    §

     Cleveland State University.

    ‖

     Universität Stuttgart.

    Cited By

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    This article is cited by 60 publications.

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    Cite this: J. Phys. Chem. B 2006, 110, 47, 23821–23828
    Click to copy citationCitation copied!
    https://doi.org/10.1021/jp065112c
    Published October 18, 2006
    Copyright © 2006 American Chemical Society
    Request reuse permissions

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