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    Unexpected Molecular Sieving Properties of Zeolitic Imidazolate Framework-8

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    Type
    Article
    Authors
    Zhang, Chen
    Lively, Ryan P.
    Zhang, Ke
    Johnson, Justin R.
    Karvan, Oguz
    Koros, William J.
    KAUST Grant Number
    KUS-I1-011-21
    Date
    2012-07-30
    Online Publication Date
    2012-07-30
    Print Publication Date
    2012-08-16
    Permanent link to this record
    http://hdl.handle.net/10754/600133
    
    Metadata
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    Abstract
    We studied molecular sieving properties of zeolitic imidazolate framework-8 (ZIF-8) by estimating the thermodynamically corrected diffusivities of probe molecules at 35 °C. From helium (2.6 Å) to iso-C 4H 10 (5.0 Å), the corrected diffusivity drops 14 orders of magnitude. Our results further suggest that the effective aperture size of ZIF-8 for molecular sieving is in the range of 4.0 to 4.2 Å, which is significantly larger than the XRD-derived value (3.4 Å) and between the well-known aperture size of zeolite 4A (3.8 Å) and 5A (4.3 Å). Interestingly, because of aperture flexibility, the studied C 4 hydrocarbon molecules that are larger than this effective aperture size still adsorb in the micropores of ZIF-8 with kinetic selectivities for iso-C 4H 8/iso-C 4H 10 of 180 and n-C 4H 10/iso-C 4H 10 of 2.5 × 10 6. These unexpected molecular sieving properties open up new opportunities for ZIF materials for separations that cannot be economically achieved by traditional microporous adsorbents such as synthetic zeolites. © 2012 American Chemical Society.
    Citation
    Zhang C, Lively RP, Zhang K, Johnson JR, Karvan O, et al. (2012) Unexpected Molecular Sieving Properties of Zeolitic Imidazolate Framework-8. The Journal of Physical Chemistry Letters 3: 2130–2134. Available: http://dx.doi.org/10.1021/jz300855a.
    Sponsors
    We would like to thank Dr. Ronald Chance for insightful comments on the manuscript and Hongzhi Wang for help on crystal size analysis. This publication is based on work supported by award no. KUS-I1-011-21, made by King Abdullah University of Science and Technology (KAUST).
    Publisher
    American Chemical Society (ACS)
    Journal
    The Journal of Physical Chemistry Letters
    DOI
    10.1021/jz300855a
    PubMed ID
    26295759
    ae974a485f413a2113503eed53cd6c53
    10.1021/jz300855a
    Scopus Count
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