期刊
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
卷 34, 期 10, 页码 4371-4378出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2009.03.031
关键词
Hydrogen storage; Zeolites; Isosteric heat; Adsorption
资金
- Regione Piemonte [C72]
- MUR
- Spanish MEC
- FEDER [MAT2005-05350]
- Conselleria d'Economia, Hisenda e Innovacio de les Illes Balears [PROGECIB-221A]
A combination of variable-temperature infrared spectroscopy with volumetric gas adsorption measurements was used to study the thermodynamics of hydrogen adsorption, at a low temperature, on calcium-exchanged zeolites X and Y. Two adsorption regimes were considered: (i) localized adsorption of dihydrogen molecules on Ca2+ cation sites, and (ii) delocalized hydrogen adsorption following saturation of the Ca2+ adsorbing centres. For localized adsorption, the corresponding enthalpy change was found to be in the range of -12 to -15 kJ mol(-1), while the isosteric heat of delocalized adsorption was found to be in the range of 4.5-5.5 kJ mol(-1). These experimental results are discussed in the broader context of corresponding data for other alkaline zeolites, with a focus on correlation between adsorption enthalpy and entropy for the localized adsorption regime. (C) 2009 International Association for Hydrogen Energy. Published by Elsevier Ltd. All rights reserved.
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