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Please use this identifier to cite or link to this item: https://dspace.lboro.ac.uk/2134/20029

Title: Analysis of adsorbate-adsorbate and adsorbate-adsorbent interactions to decode isosteric heats of gas adsorption
Authors: Madani, S. Hadi
Sedghi, Saeid
Biggs, Mark J.
Pendleton, Phillip
Issue Date: 2015
Publisher: © Wiley-VCH Verlag
Citation: MADANI, S.H. ...et al., 2015. Analysis of adsorbate-adsorbate and adsorbate-adsorbent interactions to decode isosteric heats of gas adsorption. ChemPhysChem, 16(18), pp. 3797–3805.
Abstract: A qualitative interpretation is proposed to interpret isosteric heats of adsorption by considering contributions from three general classes of interaction energy: fluid–fluid heat, fluid–solid heat, and fluid—high-energy site (HES) heat. Multiple temperature adsorption isotherms are defined for nitrogen, T=(75, 77, 79) K, argon at T=(85, 87, 89) K, and for water and methanol at T=(278, 288, 298) K on a well-characterized polymer-based, activated carbon. Nitrogen and argon are subjected to isosteric heat analyses; their zero filling isosteric heats of adsorption are consistent with slit-pore, adsorption energy enhancement modelling. Water adsorbs entirely via specific interactions, offering decreasing isosteric heat at low pore filling followed by a constant heat slightly in excess of water condensation enthalpy, demonstrating the effects of micropores. Methanol offers both specific adsorption via the alcohol group and non-specific interactions via its methyl group; the isosteric heat increases at low pore filling, indicating the predominance of non-specific interactions.
Description: This paper is in closed access.
Sponsor: This paper was supported by the Australian Research Council discovery program (DP110101293).
Version: Published
DOI: 10.1002/cphc.201500881
URI: https://dspace.lboro.ac.uk/2134/20029
Publisher Link: http://dx.doi.org/10.1002/cphc.201500881
ISSN: 1439-4235
Appears in Collections:Closed Access (Chemistry)

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