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    Bimodal pore size distributions for carbons: Experimental results and computational studies

    Access Status
    Fulltext not available
    Authors
    Gauden, P.
    Terzyk, A.
    Jaroniec, M.
    Kowalczyk, Poitr
    Date
    2007
    Type
    Journal Article
    
    Metadata
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    Citation
    Gauden, P. and Terzyk, A. and Jaroniec, M. and Kowalczyk, P. 2007. Bimodal pore size distributions for carbons: Experimental results and computational studies. Journal of Colloid and Interface Science. 310 (1): pp. 205-216.
    Source Title
    Journal of Colloid and Interface Science
    DOI
    10.1016/j.jcis.2007.01.082
    Additional URLs
    http://www.elsevier.com/locate/jcis
    ISSN
    00219797
    URI
    http://hdl.handle.net/20.500.11937/14802
    Collection
    • Curtin Research Publications
    Abstract

    It is well known that the bimodal shape of the pore size distribution (PSD) curves is typical for various carbonaceous materials (of different origin and/or treated thermally or chemically). A systematic investigation of this effect has been discussed using the Nguyen and Do method with proposed recently the ASA algorithm. A series of numerically generated adsorption isotherms (N2, T = 77 K) and experimental data were analyzed. We investigated various possible situations related to the shape of the PSD curves, i.e., the intensity of the both peaks, their mutual location and the vanishing of one of them. Moreover, the problem in the similarity of the local adsorption isotherms from the range of pore widths corresponding to the gap between peaks is discussed. The analysis of obtained results (as well as published by others) shows that the bimodal shape of the pore size distributions is a characteristic feature for many adsorbents possessing even a small amount of micropores. It is shown that this feature results from the similarity of the local adsorption isotherm in the range of the pore widths for which the gap between peaks (related to the primary and secondary micropore filling mechanism) exists. © 2007 Elsevier Inc. All rights reserved. Keywords: Activated carbon; Adsorption; Microporosity; Pore size distribution

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