Abstract
The possibility of using ammonia as a hydrogen carrier is examined for the reaction between magnesium ammine complex MgCl 2(NH 3) 6 and lithium hydride LiH. Sample was milled at low temperature of −40 °C to avoid decomposition of MgCl 2(NH 3) 6 during the milling. The effects of milling time, milling speed (revolutions per minute), and catalysts on hydrogen storage properties were investigated by thermogravimetry, thermal desorption mass spectroscopy, and X-ray diffraction experiments. Experimental results indicated that a milled composite of Mg(NH 3) 6Cl 2 and catalyzed-LiH desorbed the ∼100% H 2 gas even at 125 °C in a closed system. The reverse reaction also proceeded by separately cooling MgCl 2 at lower temperature than 100 °C and heating LiNH 2 at 300 °C in the closed system.
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