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• W2029551037 abstract "A new procedure for the direct synthesis of metal complex hydrides, NaAlH4 and LiAlH4, has been developed through hydrogenation of their respective metal hydrides, NaH and LiH, with Al, both in the presence of a catalyst and in the presence of a liquid complexing agent. This procedure involves three steps: blending the TiCl3 catalyst precursor with reactants using dry high-pressure ball milling (HPBM) in hydrogen, hydrogenation using HPBM in hydrogen and tetrahydrofuran (THF), and vacuum filtration and drying. Essentially, pure NaAlH4 and LiAlH4 products were produced in high yield at ambient temperature and near ambient pressure. For the Na and Li systems, the Ti nanoparticles, stabilized in THF, together with the formation of a MAlH4·xTHF adduct (M = Na or Li), both facilitated the hydrogenation of MH at such mild conditions. For the Na system, x was equal to 4 or 8, but the interaction was very weak, and for the Li system, x was equal to 4, but the interaction was very strong. In general, THF, the Ti catalyst, and wet HPBM all played essential roles in promoting the hydrogenation reactions, which proceeded through either a direct pathway (2MH + 2Al + 3H2 → 2MAlH4), or a sequential pathway (6MH + 2Al + 3H2 → 2M3AlH6 followed by M3AlH6 + 2Al + 3H2 → 3MAlH4), with the formation of sodium hexahydridoaluminate limiting in the latter case. The same procedure was tried unsuccessfully for the direct synthesis of Mg(AlH4)2 from MgH2 and for AlH3 from Al." @default.
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• W2029551037 date "2007-09-15" @default.
• W2029551037 modified "2023-09-26" @default.
• W2029551037 title "Synthesis of Metal Complex Hydrides for Hydrogen Storage" @default.
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• W2029551037 doi "https://doi.org/10.1021/jp072788e" @default.
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