Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 13, Issue 22, Pages 6502-6507Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.200700148
Keywords
adsorption; aluminum; electrostatic field; hydrogen; zeolites
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Several zeolites, such as faujasite, mordenite, and ZSM-5, with various aluminum contents have been used to analyze the effect of aluminum or cation concentration (strength of electrostatic field) on hydrogen adsorption at low temperature. Irrespective of the zeolite structure, the adsorption capacity, isosteric heat of adsorption (-Delta H-ads), surface coverage, and micropore occupancy increase with increasing aluminum content of a zeolite. Zeolites with a higher amount of aluminum favorably adsorb hydrogen at relatively low pressures. For zeolites with similar aluminum contents, the adsorption capacity, isosteric heat of adsorption, sur-face coverage, and micropore occupancy are in the order of mordenite > ZSM-5 > faujasite, probably due to differing pore sizes and the presence or absence of pore intersections. This work demonstrates that zeolites with strong electrostatic fields and narrow pores without intersections are beneficial for high hydrogen uptake.
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