Reversible dehydrogenation of magnesium borohydride to magnesium triborane in the solid state under moderate conditions
Reversible dehydrogenation of magnesium borohydride to magnesium triborane in the solid state under moderate conditions
复制标题
DOI：
10.1039/c0cc03461d
复制
发表时间：
2011-01-01
影响因子：
4.9
通讯作者：
Jensen, Craig M.
中科院分区：
文献类型：
--
作者：
Chong, Marina;Karkamkar, Abhi;Jensen, Craig M.
用PCT、TGA/MS和NMR研究了固态硼氢化镁Mg（BH 4）（2）的热分解。Mg（BH 4）（2）在200 ℃真空中脱氢导致高度选择性地形成三硼烷镁Mg（B3 H8）（2）。该过程在250摄氏度、120大气压H-2下可逆。在大于300摄氏度的较高温度下，在1个大气压的恒定氩气流下脱氢，产生聚硼烷物质的复杂混合物。提出了一种涉及金属氢化物形成的硼氢化物缩合机理。
Thermal decomposition of magnesium borohydride, Mg(BH4)(2), in the solid state was studied by a combination of PCT, TGA/MS and NMR spectroscopy. Dehydrogenation of Mg(BH4)(2) at 200 degrees C en vacuo results in the highly selective formation of magnesium triborane, Mg(B3H8)(2). This process is reversible at 250 degrees C under 120 atm H-2. Dehydrogenation at higher temperature, > 300 degrees 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.