Efficient synthesis of alkali borohydrides from mechanochemical reduction of borates using magnesium–aluminum-based waste
Publication date
2019-09-29
Document type
Forschungsartikel
Author
Le, Thi Thu
Pistidda, Claudio
Milanese, Chiara
Garroni, Sebastiano
Emmler, Thomas
Capurso, Giovanni
Gizer, Gökhan
Dornheim, Martin
Organisational unit
Publisher
MDPI
Series or journal
Metals
ISSN
Periodical volume
9
Periodical issue
10
Article ID
1061
Part of the university bibliography
✅
Language
English
Abstract
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.
Description
This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
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