Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 15, Issue 22, Pages 5531-5534Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.200900471
Keywords
boranes; hydrogenation; hydrogen storage; lithium borohydride
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Funding
- European Commission [518271]
- Swiss National Science Foundation [200021-119972/1]
- Swiss Federal Office of Energy
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The solvent-free synthesis of LiBH4 from LiH in a borane atmosphere at 120 degrees C and ambient pressures is demonstrated. The Source of borane is a milled LiBH4/ZnCl2 mixture, in which Zn(BH4)(2) is generated by a metathesis reaction. The yield of the reaction of about 74% LiBH4 shows that a bulk reaction is taking place upon borane absorption by LiH. This indicates that the formation of B-H bonds is the limiting step for the formation of LiBH4 from the elements. Therefore, the use of diborane as a starting reactant allows one to circumvent the reaction harrier for the B-B bond dissociation and explains the rather moderate synthesis conditions.
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