Abstract
Solid reactions between alkali aluminum hydrides (MAlH 4, M = Li or Na) and NH 4Cl (at mole ratio 1:1) at 170 °C were investigated quantitatively using temperature programmed reaction (TPR), thermo-gravimetric analysis (TGA), differential scanning calorimetry (DSC) and x-ray diffraction (XRD). The release of 3 mol of H 2 from per mole of MAlH 4 was measured, corresponding to 5.6 wt.% H 2 capacity for the NaAlH 4/NH 4Cl system and 6.6 wt.% for LiAlH 4/NH 4Cl, respectively. By ball milling of the precursor compounds prior to the mixing, the reaction proceeded fast and NH 3 production as the by-product could be avoided. The quick solid reactions may be attributed to the low melting temperatures of MAlH 4 and the exothermic nature of the reactions. The reaction mechanism was also discussed.
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