Effect of Oxygen on the Mg-H Reaction

B. Vigeholm, John Kjøller, Bent Larsen, Allan Schrøder Pedersen

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    Two identical samples of magnesium powder (purity, 99.58%) were hydrogenated at approximately 30 bar and 380 °C and dehydrogenated under vacuum at the same temperature about 500 times. The first sample was exposed to pure hydrogen (purity, 99.9999%) and the second was exposed to hydrogen containing 85 ppm O and 8 ppm H2O vapour. In both experiments a moderate overall reduction in the amount of hydrogen absorbed and desorbed was observed. This can be ascribed to a reduced absorption rate with increased number of cycles. The effect of oxygen was negligible, and this was confirmed by a precision absorption measurement performed after the cycling experiment. Despite the decreased absorption rate, which was mainly observed at higher degrees of reaction, little change in the desorption kinetics was observed.
    Original languageEnglish
    JournalJournal of Alloys and Compounds
    Issue number1
    Pages (from-to)141-148
    Publication statusPublished - 1984


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