Madani S Hadi, Sedghi Saeid, Biggs Mark J, Pendleton Phillip
Ian Wark Research Institute, University of South Australia, Mawson Lakes, SA, 5095, Australia), Tel: +61 (0)8 8302 2188.
School of Chemical Engineering, University of Adelaide, Adelaide, SA, 5005, Australia.
Chemphyschem. 2015 Dec 21;16(18):3797-805. doi: 10.1002/cphc.201500881. Epub 2015 Nov 17.
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.
本文提出了一种定性解释方法，通过考虑三类相互作用能的贡献来解释等量吸附热：流体-流体温、流体-固体温和流体-高能位点（HES）热。定义了氮气在T=(75, 77, 79) K、氩气在T=(85, 87, 89) K以及水和甲醇在T=(278, 288, 298) K时在一种特性良好的聚合物基活性炭上的多个温度吸附等温线。对氮气和氩气进行了等量热分析；它们的零填充等量吸附热与狭缝孔、吸附能增强模型一致。水完全通过特定相互作用吸附，在低孔隙填充时等量热降低，随后是略高于水冷凝焓的恒定热，这表明了微孔的影响。甲醇既通过醇基提供特定吸附，又通过甲基提供非特定相互作用；等量热在低孔隙填充时增加，表明非特定相互作用占主导。
