Hydrogen adsorption measurements and modeling on metal-organic frameworks and single-walled carbon nanotubes.
Hydrogen adsorption measurements on Al-, Cr-, and Zn-based metal-organic frameworks (MOFs) and single-walled carbon nanotubes (SWNTs) are presented. The measurements were performed at temperatures ranging from 77 to 300 K and pressures up to 50 atm using a volumetric approach. The maximum excess adsorption at 77 K ranges from 2.3 to 3.9 wt % for the MOFs and from 1.5 to 2.5 wt % for the SWNTs. These values are reached at pressures below 40 atm. At room temperature and 40 atm, modest amounts of hydrogen are adsorbed (<0.4 wt %). A Dubinin-Astakhov (DA) approach is used to investigate the measured adsorption isotherms and to retrieve energetic and structural parameters. The adsorption enthalpy averaged over filling is about 2.9 kJ/mol for the MOF-5 and about 3.6-4.2 kJ/mol for SWNTs.
Poirier
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Institut de recherche sur l'hydrogène, Université du Québec à Trois-Rivières, C.P. 500 Trois-Rivières, Québec, G9A 5H7, Canada. Richard.Chahine@uqtr.ca
Chahine
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Bénard
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Lafi
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Dorval-Douville
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Chandonia
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