Metal borohydride formation from aluminium boride and metal hydrides
MetadataShow full item record
© the Owner Societies 2016.Metal borides are often decomposition products from metal borohydrides and thus play a role in the reverse reaction where hydrogen is absorbed. In this work, aluminium boride, AlB2, has been investigated as a boron source for the formation of borohydrides under hydrogen pressures of p(H2) = 100 or 600 bar at elevated temperatures (350 or 400 °C). The systems AlB2-MHx (M = Li, Na, Mg, Ca) have been investigated, producing LiBH4, NaBH4 and Ca(BH4)2, whereas the formation of Mg(BH4)2 was not observed at T = 400 °C and p(H2) = 600 bar. The formation of the metal borohydrides is confirmed by powder X-ray diffraction and infrared spectroscopy and the fraction of boron in AlB2 and M(BH4)x is determined quantitatively by 11B MAS NMR. Hydrogenation for 12 h at T = 350-400 °C and p(H2) = 600 bar leads to the formation of substantial amounts of LiBH4 (38.6 mol%), NaBH4 (83.0 mol%) and Ca(BH4)2 (43.6 mol%).
Showing items related by title, author, creator and subject.
Paskevicius, Mark; Jepsen, L.; Schouwink, P.; Cerný, R.; Ravnsbæk, D.; Filinchuk, Y.; Dornheim, M.; Besenbacher, F.; Jensen, T. (2017)© The Royal Society of Chemistry 2017.A wide variety of metal borohydrides, MBH4, have been discovered and characterized during the past decade, revealing an extremely rich chemistry including fascinating structural ...
Paskevicius, Mark; Richter, B.; Polanski, M.; Thompson, S.; Jensen, T. (2015)© 2016 The Royal Society of Chemistry.The reactions between metal borohydrides and elemental sulfur are investigated in situ during thermal treatment and are found to be highly exothermic (up to 700 J g-1). These reactions ...
The influence of LiH on the rehydrogenation behavior of halide free rare earth (RE) borohydrides (RE = Pr, Er)Heere, M.; Payandeh GharibDoust, S.; Frommen, C.; Humphries, Terry; Ley, M.; Sørby, M.; Jensen, T.; Hauback, B. (2016)© 2016 the Owner Societies. Rare earth (RE) metal borohydrides are receiving immense consideration as possible hydrogen storage materials and solid-state Li-ion conductors. In this study, halide free Er(BH4)3 and Pr(BH4)3 ...