%0 journal article
%@ 0360-3199
%A Pottmaier, D.,Pistidda, C.,Groppo, E.,Bordiga, S.,Spoto, G.,Dornheim, M.,Baricco, M.

%D 2011
%J International Journal of Hydrogen Energy
%N 13
%P 7891-7896 
%R doi:10.1016/j.ijhydene.2011.01.059
%T Dehydrogenation reactions of 2NaBH4 + MgH2 system
%U https://doi.org/10.1016/j.ijhydene.2011.01.059
13 
%X Reactive Hydride Composites (RHCs), ball-milled composites of two or more different hydrides, are suggested as an alternative for solid state hydrogen storage. In this work, dehydrogenation of 2NaBH4 + MgH2 system under vacuum was investigated using complementary characterization techniques. At first, thermal programmed desorption of as-milled composite and single compounds was used to identify the temperature range of hydrogen release. RHC samples annealed at various temperatures up to 500 °C were characterized by X-ray diffraction, infrared spectroscopy and scanning electron microscopy. It was found that the dehydrogenation reaction under vacuum is likely to proceed as follows: 2NaBH4 + MgH2 (>250 °C) → 2NaBH4 + 1/2MgH2 + 1/2Mg + 1/2H2 (>350 °C) ↔ 3/2NaBH4 + 1/4MgB2 + 1/2NaH + 3/4Mg + 7/4H2 (>450 °C) → 2Na + B + 1/2Mg + 1/2MgB2 + 5H2. In addition, presence of NaMgH3 phase suggests the occurrence of secondary reactions.