Berlin 2008 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 33: SYM Hydrogen in Materials: New Developments I
MM 33.2: Talk
Thursday, February 28, 2008, 10:45–11:05, H 1058
Isosteric heat of adsorption for hydrogen in microporous materials — •Barbara Schmitz1,2 and Michael Hirscher1 — 1Max-Planck-Institut für Metallforschung, Stuttgart, Germany — 2Universität Bonn, Germany
The adsorption of hydrogen in activated carbon and metal organic frameworks is measured with an automated Sieverts apparatus. The pressure dependent hydrogen uptake is investigated at several temperatures above 77K and pressures up to 20bar. The total uptake is correlated to the specific surface area. From the adsorption isotherms the isosteric heat of adsorption is evaluated within a wide range of surface coverage between 0.2 and 0.8. The results are related to the structure of the different materials.
Acknowledgment: Partial funding by the European Commission DG Research (contract SES6-2006-518271/ NESSHY) is gratefully acknowledged by the authors.