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Hydrogen desorption from ball milled MgH2 catalyzed with Fe

TitleHydrogen desorption from ball milled MgH2 catalyzed with Fe
Publication TypeArticolo su Rivista peer-reviewed
Year of Publication2005
AuthorsBassetti, A., Bonetti E., Pasquini L., Montone Amelia, Grbović J., and Antisari M.V.
JournalEuropean Physical Journal B
Volume43
Pagination19-27
ISSN14346028
KeywordsBall milling, Catalysis, Catalysts, Dehydrogenation, Dehydrogenation kinetics, Desorption, Hydrides, Hydrogen, Hydrogen desorption, Iron, Magnesium compounds, Mechanical alloying, Metal hydrides, Nanostructured materials, Reaction kinetics, Sorption kinetics
Abstract

In order to obtain faster hydrogen sorption kinetics, MgH2-Fe nanocomposites were prepared by high-energy ball milling. The MgH2 decomposition was studied in samples obtained by changing in a systematic way both the catalyst amount and the degree of microstructural refinement. To this purpose, blends containing increasing Fe concentration have been ball milled in processing conditions able to impart different amount of structural defects. The resulting samples have been characterized by X-ray diffraction to investigate the microstructural features and the phase composition, while the powder morphology and the degree of catalyst dispersion were analyzed by scanning electron microscopy. Differential scanning calorimetry was carried out to characterize the hydrogen desorption behavior of these nanocomposites. Experimental results clearly show that the characteristics of the desorption process are dominated, among other factors, by the morphology of the catalyst dispersion, which in turns depends on the processing conditions and blend composition. In order to achieve low desorption temperatures the homogeneous catalyst dispersion in micron-size particles throughout the structure is required. This condition can be achieved by suitable tuning of the milling conditions and of the catalyst amount. © EDP Sciences, Società Italiana di Fisica, Springer-Verlag 2005.

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URLhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-21144457727&doi=10.1140%2fepjb%2fe2005-00023-9&partnerID=40&md5=5578771fc560625d983a83c24941c315
DOI10.1140/epjb/e2005-00023-9
Citation KeyBassetti200519