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The Dehydrogenation Mechanism and Reversibility of LiBH4 Doped by Active Al Derived from AlH3
Open AccessArticle

Efficient Synthesis of Alkali Borohydrides from Mechanochemical Reduction of Borates Using Magnesium–Aluminum-Based Waste

1
Institute of Materials Research, Materials Technology, Helmholtz-Zentrum Geesthacht GmbH, Max-Planck-Strasse 1, Geesthacht D-21502, Schleswig-Holstein, Germany
2
Department of Physical chemistry of Materials, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) and Centro Atómico Bariloche, Av. Bustillo km 9500 S.C. de Beriloche, Argentina
3
Pavia H2 Lab, C.S.G.I. & Department of Chemistry, Physical Chemistry Section, University of Pavia, 27100 Pavia, Italy
4
Department of Chemistry and Pharmacy and INSTM, University of Sassari, Via Vienna 2, 07100 Sassari, Italy
5
Helmut Schmidt University, University of the Federal Armed Forces Hamburg, D-22043 Hamburg, Germany
*
Author to whom correspondence should be addressed.
Metals 2019, 9(10), 1061; https://doi.org/10.3390/met9101061
Received: 23 August 2019 / Revised: 19 September 2019 / Accepted: 24 September 2019 / Published: 29 September 2019
(This article belongs to the Special Issue Metals in Hydrogen Technology)
Lithium borohydride (LiBH4) and sodium borohydride (NaBH4) were synthesized via mechanical milling of LiBO2, and NaBO2 with Mg–Al-based waste under controlled gaseous atmosphere conditions. Following this approach, the results herein presented indicate that LiBH4 and NaBH4 can be formed with a high conversion yield starting from the anhydrous borates under 70 bar H2. Interestingly, NaBH4 can also be obtained with a high conversion yield by milling NaBO2·4H2O and Mg–Al-based waste under an argon atmosphere. Under optimized molar ratios of the starting materials and milling parameters, NaBH4 and LiBH4 were obtained with conversion ratios higher than 99.5%. Based on the collected experimental results, the influence of the milling energy and the correlation with the final yields were also discussed. View Full-Text
Keywords: alkali borohydrides; Mg–Al waste; ball milling; high conversion yield alkali borohydrides; Mg–Al waste; ball milling; high conversion yield
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Le, T.T.; Pistidda, C.; Puszkiel, J.; Milanese, C.; Garroni, S.; Emmler, T.; Capurso, G.; Gizer, G.; Klassen, T.; Dornheim, M. Efficient Synthesis of Alkali Borohydrides from Mechanochemical Reduction of Borates Using Magnesium–Aluminum-Based Waste. Metals 2019, 9, 1061.

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