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Dehydrogenation kinetics of air-exposed MgH2/Mg2Cu and MgH2/MgCu2 studied with in situ X-ray powder diffraction |
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| Authors: | A. Andreasen M.B. Sørensen R. Burkarl B. Møller A.M. Molenbroek A.S. Pedersen T. Vegge T.R. Jensen |
| Affiliation: | 1. Materials Research Department, Ris? National Laboratory, 4000, Roskilde, Denmark 2. Interdisciplinary Research Center for Catalysis, Department of Chemical Engineering, Technical University of Denmark, 2800, Lyngby, Denmark 3. Department of Chemistry, iNANO, Aarhus University, 8000, Aarhus C, Denmark 4. Haldor Tops?e A/S, 2800, Kgs. Lyngby, Denmark 5. CAMP and Department of Physics, Technical University of Denmark, 2800, Kgs. Lyngby, Denmark 6. Danfoss Corporate Ventures A/S, 6430, Nordborg, Denmark |
| Abstract: | The dehydrogenation kinetics of air exposed samples of MgH2/Mg2Cu and MgH2/MgCu2 have been studied with in situ time resolved X-ray powder diffraction. The X-ray setup enabled the recording of full diffraction patterns within 150 s, thereby allowing the study of structural changes combined with simultaneous extraction of kinetic parameters. Phase fractions as a function of time and temperature were derived from series of consecutive diffraction patterns by numerical integration of selected diffraction peaks. The apparent activation energy for the dehydrogenation of the MgH2/Mg2Cu, and MgH2/MgCu2 sample was found to be 108 kJ/mol and 160 kJ/mol, respectively. Furthermore, substantially improved dehydrogenation kinetics of MgH2 and resistance towards oxidation of Mg due to the presence of Mg2Cu/MgCu2 are discussed in relation to previous work. PACS 61.10.Nz; 81.65.Mq; 82.20.Pm |
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