Murialdo Maxwell, Stadie Nicholas P, Ahn Channing C, Fultz Brent
W. M. Keck Laboratory, California Institute of Technology, 138-78, Pasadena, California 91125, United States.
Langmuir. 2015 Jul 28;31(29):7991-8. doi: 10.1021/acs.langmuir.5b01497. Epub 2015 Jul 16.
Krypton adsorption was measured at eight temperatures between 253 and 433 K on a zeolite-templated carbon and two commercial carbons. The data were fitted using a generalized Langmuir isotherm model and thermodynamic properties were extracted. Differing from that on commercial carbons, krypton adsorption on the zeolite-templated carbon is accompanied by an increasing isosteric enthalpy of adsorption, rising by up to 1.4 kJ mol(-1) as a function of coverage. This increase is a result of enhanced adsorbate-adsorbate interactions promoted by the ordered, nanostructured surface of the adsorbent. An assessment of the strength and nature of these adsorbate-adsorbate interactions is made by comparing the measured isosteric enthalpies of adsorption (and other thermodynamic quantities) to fundamental metrics of intermolecular interactions of krypton and other common gases.
在253至433 K之间的八个温度下，测量了氪在沸石模板碳和两种商用碳上的吸附情况。使用广义朗缪尔等温线模型对数据进行拟合，并提取了热力学性质。与商用碳上的情况不同，氪在沸石模板碳上的吸附伴随着吸附等量焓的增加，随覆盖度的变化，吸附等量焓增加高达1.4 kJ mol⁻¹。这种增加是由于吸附剂有序的纳米结构表面促进了吸附质 - 吸附质相互作用增强所致。通过将测得的吸附等量焓（以及其他热力学量）与氪和其他常见气体分子间相互作用的基本指标进行比较，对这些吸附质 - 吸附质相互作用的强度和性质进行了评估。
