Synthesis and characterization of a Mg–Ni-RE alloy for hydrogen storage

A. Dell'Era, M. Pasquali, S. Vecchio Ciprioti, C. Lupi, A. Brotzu, F. Mura, R. Tuffi

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Abstract

The synthesis and characterization of a Mg–Ni alloy having La and Ce as catalysts, have been performed. The alloy behavior was studied at given fixed temperature and pressure during hydrogen absorption/desorption tests. The La and Ce addition was carried out starting from a commercial alloy, named “Firesteel”. The alloy synthesized has the following formula Mg68Ni26M5X, where X represents Si and Fe impurities and M stands for the mixture of rare earths metals. The alloy has been prepared by a melting process in an induction furnace equipped with a centrifugal casting system and then grinded, by both hydraulic press and ball milling. The alloy has been characterized by SEM, BET, XRD, DSC-TGA analysis and by a mass flow measurement apparatus. The experiments on alloy sample showed that, after activation, hydrogenation occurs at 300 °C in three stages at three different pressures: 3, 4 and 7 atm, involving respectively 0.15 wt%, 0.4 wt% and 2.2 wt% of hydrogen absorbed. Reversible hydride dehydrogenation, inside the mass flow measurement apparatus, requires a working temperature of 350 °C to obtain, with remarkable reaction rate, about 2.7%, hydrogen desorption.
Original languageEnglish
Pages (from-to)26333 - 26342
Number of pages10
JournalInternational Journal of Hydrogen Energy
Volume42
Issue number42
DOIs
Publication statusPublished - 19 Oct 2017
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

Cite this

Dell'Era, A., Pasquali, M., Vecchio Ciprioti, S., Lupi, C., Brotzu, A., Mura, F., & Tuffi, R. (2017). Synthesis and characterization of a Mg–Ni-RE alloy for hydrogen storage. International Journal of Hydrogen Energy, 42(42), 26333 - 26342. https://doi.org/10.1016/j.ijhydene.2017.08.207