Thermodynamics of hydrogen adsorption on calcium-exchanged faujasite-type zeolites

Thermodynamics of hydrogen adsorption on calcium-exchanged faujasite-type zeolites

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 dihydr...

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Bibliographic Details
Published in:International journal of hydrogen energy Vol. 34; no. 10; pp. 4371 - 4378
Main Authors: Palomino, G.T., Bonelli, B., Areán, C.O., Parra, J.B., Carayol, M.R.L., Armandi, M., Ania, C.O., Garrone, E.
Format: Journal Article
Language:English
Published: Kidlington Elsevier Ltd 01-05-2009
Elsevier
Subjects:
Adsorption
Alternative fuels. Production and utilization
Applied sciences
Catalysis
Chemical Sciences
Correlation
Energy
Enthalpy
Entropy
Environmental Engineering
Environmental Sciences
Exact sciences and technology
Fuels
Hydrogen
Hydrogen storage
Infrared spectroscopy
Isosteric heat
Material chemistry
Saturation
Thermodynamics
Zeolites
Hydrogen storage
Adsorption
Zeolites
Isosteric heat
Measurement
Calcium
Enthalpy
Entropy
Zeolite
Molecular sieve
Infrared spectrometry
Thermodynamics
Faujasite
Low temperature
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Summary: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 −15kJmol−1, while the isosteric heat of delocalized adsorption was found to be in the range of 4.5–5.5kJmol−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.
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ISSN:0360-3199
1879-3487
DOI:10.1016/j.ijhydene.2009.03.031