Solid-Phase Solvate-Free Formation of Magnesium Hydroaluminates Mg(AlH4)2and MgAlH5upon Mechanochemical Activation or Heating of Magnesium Hydride and Aluminum Chloride Mixtures
Tóm tắt
It is shown that vibromechanically activated or heated magnesium hydride is capable of solid-phase interacting with aluminum chloride to form magnesium tetra- and pentahydroaluminates (Mg(AlH4)2and MgAlH5). When heated above 100°C, Mg(AlH4)2undergoes thermolysis (or mechanolysis upon mechanical activation) to form MgAlH5and AlH3. The latter liberates aluminum and hydrogen in the moment of isolation. In the 230 to 280°C interval, MgAlH5also loses reactive AlH3 ⊙. On further heating, the obtained active aluminum and MgH2give intermetallide Al2Mg. The ability of Mg(AlH4)2to transform into MgAlH5by the addition of excessive activated MgH2, as in the case of Sr(AlH4)2, is revealed.
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