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https://hdl.handle.net/2440/100687
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Type: | Journal article |
Title: | Analysis of adsorbate-adsorbate and adsorbate-adsorbent Interactions to decode isosteric heats of gas adsorption |
Author: | Madani, S. Sedghi, S. Biggs, M. Pendleton, P. |
Citation: | ChemPhysChem: a European journal of chemical physics and physical chemistry, 2015; 16(18):3797-3805 |
Publisher: | Wiley Online Library |
Issue Date: | 2015 |
ISSN: | 1439-4235 1439-7641 |
Statement of Responsibility: | S. Hadi Madani, Saeid Sedghi, Mark J. Biggs and Phillip Pendleton |
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. |
Keywords: | Condensation heat gas adsorption isosteric heat of adsorption non-specific interactions specific interactions |
Rights: | © 2015 Wiley-VCH Verlag GmbH &Co. KGaA, Weinheim |
DOI: | 10.1002/cphc.201500881 |
Grant ID: | http://purl.org/au-research/grants/arc/DP110101293 |
Published version: | http://dx.doi.org/10.1002/cphc.201500881 |
Appears in Collections: | Aurora harvest 7 Chemical Engineering publications |
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