Reversible dehydrogenation of magnesium borohydride to magnesium triborane in the solid state under moderate conditions |
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Authors: | Chong Marina Karkamkar Abhi Autrey Tom Orimo Shin-ichi Jalisatgi Satish Jensen Craig M |
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Institution: | Department of Chemistry, University of Hawaii at Manoa, 2545 McCarthy Mall, Honolulu, HI 96822-2275, USA. |
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Abstract: | Thermal decomposition of magnesium borohydride, Mg(BH(4))(2), in the solid state was studied by a combination of PCT, TGA/MS and NMR spectroscopy. Dehydrogenation of Mg(BH(4))(2) at 200 °C en vacuo results in the highly selective formation of magnesium triborane, Mg(B(3)H(8))(2). This process is reversible at 250 °C under 120 atm H(2). Dehydrogenation at higher temperature, >300 °C under a constant argon flow of 1 atm, produces a complex mixture of polyborane species. A borohydride condensation mechanism involving metal hydride formation is proposed. |
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