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Combined Application of Tracer Zero Length Column Technique and Pulsed Field Gradient Nuclear Magnetic Resonance for Studies of Diffusion of Small Sorbate Molecules in Mesoporous Silica SBA-15

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    Combined Application of Tracer Zero Length Column Technique and Pulsed Field Gradient Nuclear Magnetic Resonance for Studies of Diffusion of Small Sorbate Molecules in Mesoporous Silica SBA-15
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    Department of Chemical Engineering, University of Florida, Gainesville, Florida 32611, Department of Chemical Engineering, University of New Brunswick, Fredericton, New Brunswick, E3B 5A3, Canada, Département de Génie Chimique, Université Laval, Québec, G1 V 0A6, Canada, and Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Laboratory of Advanced Materials, Fudan University, Shanghai, China
    * To whom correspondence should be addressed: Phone: +1 352 392 0315. Fax: +1 352 392 0315. E-mail: [email protected]
    †University of Florida.
    ‡University of New Brunswick.
    §Université Laval.
    ∥Fudan University.
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    The Journal of Physical Chemistry C

    Cite this: J. Phys. Chem. C 2010, 114, 39, 16298–16308
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    https://doi.org/10.1021/jp105882s
    Published September 10, 2010
    Copyright © 2010 American Chemical Society
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    Abstract

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    Tracer zero length column (TZLC) and pulsed field gradient (PFG) NMR techniques were used to study self-diffusion of toluene in two samples of SBA-15 silica. Analysis of the diffusion data allowed us to assign evaluated diffusivities to diffusion of toluene in pore systems of SBA-15 particles. It was observed that there is a large discrepancy between the values of the diffusivities obtained by the two techniques under very similar experimental conditions. The most likely reason of this discrepancy is related to the particular morphology of the SBA-15 particles, which form stringlike aggregates with lengths close to 20−30 μm. As a consequence of the formation of such aggregate structures some mesoporous channels can be as long as the length of these structures. These long channels are expected to have transport barriers at the points of intergrowth of primary particles. Other channels are much shorter and are not expected to exhibit any significant transport barriers. Under the experimental conditions used TZLC measurements are most sensitive to sorbate diffusion in the channels of the former type. At the same time, PFG NMR measurements are expected to be more sensitive to diffusion in the channels of the latter type where T2 NMR relaxation times are not shortened by the presence of multiple transport resistances. As a result, these two techniques can provide complementary diffusion data on sorbate transport in SBA-15 materials.

    Copyright © 2010 American Chemical Society

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    The Journal of Physical Chemistry C

    Cite this: J. Phys. Chem. C 2010, 114, 39, 16298–16308
    Click to copy citationCitation copied!
    https://doi.org/10.1021/jp105882s
    Published September 10, 2010
    Copyright © 2010 American Chemical Society
    Request reuse permissions

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