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    On the adsorbate restructuring induced hysteresis of simple gas adsorption in slit micropores

    Access Status
    Fulltext not available
    Authors
    Diao, R.
    Fan, Chunyan
    Do, D.
    Nicholson, D.
    Date
    2016
    Type
    Journal Article
    
    Metadata
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    Citation
    Diao, R. and Fan, C. and Do, D. and Nicholson, D. 2016. On the adsorbate restructuring induced hysteresis of simple gas adsorption in slit micropores. Chemical Engineering Journal. 290: pp. 381-390.
    Source Title
    Chemical Engineering Journal
    DOI
    10.1016/j.cej.2016.01.072
    ISSN
    1385-8947
    School
    Department of Chemical Engineering
    URI
    http://hdl.handle.net/20.500.11937/31768
    Collection
    • Curtin Research Publications
    Abstract

    Simulations of adsorption isotherms for simple gases in homogeneous slit pores with two open ends often show hysteresis, between condensation and evaporation branches. The hysteresis may result either, from the difference in the curvature of the interface separating the adsorbed and gas phases, or from molecular restructuring when the adsorbate is densely packed. The order-disorder transition that occurs in the second case, has also been observed experimentally for adsorption on a graphite surface, and is supported by molecular simulation (Duval and Thomy, 1975; Ustinov and Do, 2012). In this paper we report a comprehensive set of GCMC simulations designed to explore the effects of pore size and temperature on the hysteresis loop induced by adsorbate restructuring. We report isotherms, isosteric heats, and microscopic analyses of the local density distribution, and the 2D and 3D radial density distributions. Local compressibilities reinforce the supposition that adsorbate restructuring is the origin of the ordering hysteresis.

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