Thermodynamics of hydrogen adsorption on the zeolite Li-ZSM-5

Thermodynamic characterisation of the adsorption process (at a low temperature) of dihydrogen on the zeolite Li-ZSM-5 was carried out by means of variable-temperature infrared spectroscopy, with the simultaneous measurement of temperature and equilibrium pressure. Adsorption renders the H–H stretchi...

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Bibliographic Details
Published in:Chemical physics letters 2003-03, Vol.370 (5), p.631-635
Main Authors: Otero Areán, C., Manoilova, O.V., Bonelli, B., Rodrı&#x0301, guez Delgado, M., Turnes Palomino, G., Garrone, E.
Format: Article
Language:English
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Summary:Thermodynamic characterisation of the adsorption process (at a low temperature) of dihydrogen on the zeolite Li-ZSM-5 was carried out by means of variable-temperature infrared spectroscopy, with the simultaneous measurement of temperature and equilibrium pressure. Adsorption renders the H–H stretching mode infrared active, at 4092 cm −1 . The standard adsorption enthalpy and entropy resulted to be ΔH 0=−6.5(±0.5) kJ mol −1 and ΔS 0=−90(±5) J mol −1 K −1 , respectively. The adsorption enthalpy is significantly larger than the liquefaction heat, and this fact renders Li-ZSM-5 a potential cryoadsorbent for hydrogen storage.
ISSN:0009-2614
1873-4448
DOI:10.1016/S0009-2614(03)00172-6