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.
Highlights
Tetrahydroborates, discovered in the 1940s, have been attracting the attention of the scientific community in the last decades as possible energy vectors
As suggested by the differential thermal analysis (DTA) shown in Figure S1, NaBO2 was obtained by heating
This work demonstrated that the synthesis of NaBH4 and LiBH4 from low-cost starting materials, such This as metaborate compounds and waste, employing a common industrialstarting method, such as 4 and LiBH
Summary
Tetrahydroborates, discovered in the 1940s, have been attracting the attention of the scientific community in the last decades as possible energy vectors. Their use as single hydrides [5,6,7,8,9,10,11,12] and their combination in the so-called reactive hydride composites (RHCs) approach were intensively studied [13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28] These tetrahydroborates were first synthesized by Schlesinger and Brown by reacting diborane with ethyl lithium to form LiBH4 [29] and with sodium trimethoxyborohydride to form NaBH4 [30].
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