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Effect of carbon type (graphite, CFs and diamond) on the hydrogen desorption of Mg-C powder mixtures under microwave irradiation

hal.structure.identifierLaboratoire de Chimie Physique des Matériaux [LCPM]
dc.contributor.authorAWAD, Abdel Salam
hal.structure.identifierLaboratoire de Chimie Physique des Matériaux [LCPM]
dc.contributor.authorTAYEH, Toufic
hal.structure.identifierLaboratoire de Chimie Physique des Matériaux [LCPM]
dc.contributor.authorNAKHL, Michel
hal.structure.identifierLaboratoire de Chimie Physique des Matériaux [LCPM]
dc.contributor.authorZAKHOUR, Mirvat
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorOURANE, Bassem
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorLE TROËDEC, Marianne
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorBOBET, Jean-Louis
dc.date.issued2014
dc.identifier.issn0925-8388
dc.description.abstractEnBinary MgH2-x wt% C mixtures (x = 0, 2, 5 and 10 wt% for carbon fibers (CFs), 10 wt% for graphite (G) and diamond (D)) were prepared by hand mixing and by ball milling (5 h) for MgH2-10 wt% CFs. The aims of the work were: - to investigate the dehydriding reaction of MgH2 catalyzed by carbon under microwave irradiation; - to assess the effect of presence of different carbon type and content on the desorption reaction; - to evaluate the influence microwave power on the rate of hydrogen release; to study the influence of milling process on the dehydrogenation time. The amount of hydride and Mg phases (e.g. hydrogen content) was estimated from XRD pattern matching (Eva and Fullprof). The morphology of the powders and the particle size distribution were observed by Scanning Electron Microscopy (SEM) and laser granulometry respectively. Carbon distribution in the MgH2 matrix was investigated by electron probe microanalyses. The different carbon type transfer the heat, generated from absorbed microwave irradiation, to the MgH2 matrix which induces the hydrogen release. It was found that the dehydrogenation rate and time were enhanced with rising carbon content, microwave power and with milling time. For the MgH2-10 wt% CFs mixtures, under 1500 W of microwave, more than 90% of conversion MgH2 to Mg phases was obtained after 20 s for hand mixing mixture and after only 10 s for 5 h ball milled one.
dc.language.isoen
dc.publisherElsevier
dc.subject.enMicrowave power
dc.subject.enMagnesium hydride
dc.subject.enX-ray diffraction
dc.subject.enCarbon additives
dc.subject.enBall milling
dc.title.enEffect of carbon type (graphite, CFs and diamond) on the hydrogen desorption of Mg-C powder mixtures under microwave irradiation
dc.typeArticle de revue
dc.identifier.doi10.1016/j.jallcom.2014.04.027
dc.subject.halChimie/Matériaux
bordeaux.journalJournal of Alloys and Compounds
bordeaux.page223-229
bordeaux.volume607
bordeaux.peerReviewedoui
hal.identifierhal-00999027
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00999027v1
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