Evaluation of Adsorption Properties of Low Surface Area Carbons—Comparison of Experiments with a Theoretical Study |
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Authors: | P Kluson SJ Scaife |
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Affiliation: | (1) Faculty of Chemical Technology, Technicka 5, 166 28 Prague 6, Czech Republic;(2) Department of Chemistry, University of Wales in Bangor, Gwynedd, LL57 2UW, UK |
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Abstract: | Adsorption isotherms of nitrogen, argon and methane were experimentally measured at 77 K on low surface area graphitised carbons and natural graphite. For direct comparison, theoretical isotherms for the same gases were calculated on a model, flat surface by using NL DFT. Vulcan (a graphitised carbon black, often used as a surface area standard) was shown to represent a good approximation of a flat graphite surface. It is a suitable material for evaluation of potential parameters in modelling of adsorption in micropores. It was also confirmed that the non-local density functional theory provided a good and reliable fit to experimental adsorption isotherms. SEM microscopy and x-ray diffraction revealed surface properties consistent with those evaluated by adsorption. |
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Keywords: | adsorption of nitrogen adsorption of argon adsorption of methane non-local density functional theory graphite graphitised carbons |
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