Probing Mass Transfer in Mesoporous Faujasite-Type Zeolite Nanosheet Assemblies

Authors

  • Dirk Mehlhorn,

    1. Faculty of Physics and Earth Science, University of Leipzig, Linnèstraße 5, 04103 Leipzig (Germany)
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  • Alexandra Inayat,

    1. Institute of Chemical Reaction Engineering, University Erlangen-Nürnberg, Egerlandstraße 3, 91058 Erlangen (Germany)
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  • Prof. Dr. Wilhelm Schwieger,

    Corresponding author
    1. Institute of Chemical Reaction Engineering, University Erlangen-Nürnberg, Egerlandstraße 3, 91058 Erlangen (Germany)
    • Wilhelm Schwieger, Institute of Chemical Reaction Engineering, University Erlangen-Nürnberg, Egerlandstraße 3, 91058 Erlangen (Germany)===

      Jörg Kärger, Faculty of Physics and Earth Science, University of Leipzig, Linnèstraße 5, 04103 Leipzig (Germany)===

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  • Dr. habil. Rustem Valiullin,

    1. Faculty of Physics and Earth Science, University of Leipzig, Linnèstraße 5, 04103 Leipzig (Germany)
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  • Prof. Dr. Jörg Kärger

    Corresponding author
    1. Faculty of Physics and Earth Science, University of Leipzig, Linnèstraße 5, 04103 Leipzig (Germany)
    • Wilhelm Schwieger, Institute of Chemical Reaction Engineering, University Erlangen-Nürnberg, Egerlandstraße 3, 91058 Erlangen (Germany)===

      Jörg Kärger, Faculty of Physics and Earth Science, University of Leipzig, Linnèstraße 5, 04103 Leipzig (Germany)===

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Abstract

Pulsed field gradient nuclear magnetic resonance (NMR) diffusion studies are performed by using cyclohexane to probe transport properties in a NaX-type zeolite with a hierarchical pore structure (house-of-cards-like assemblies of mesoporous nanosheets), which is compared with a purely microporous sample. With guest loadings chosen to ensure saturation of the micropores, and the meso- and macropores left essentially unoccupied, guest diffusion is shown to be enhanced by almost one order of magnitude, even at room temperature. Diffusivity enhancement is further increased with increasing temperature, which may, therefore, be unambiguously attributed to the contribution of mass transfer in the meso- and macropores.

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