Abstract
NaAlH 4 was mechano-chemically synthesized with high energy ball-milling method. The effect of synthesis conditions such as milling time, H 2 pressure, chloride catalysts, and solvents was investigated to enhance the synthesis of NaAlH 4 . Among the chloride catalysts, TiCl 4 showed the highest H 2 pressure decrease which means the highest NaH conversion to NaAlH 4 . Furthermore, when the NaAlH 4 was synthesized with THF solvent, it exhibited the higher H 2 pressure decrease than that of sample prepared without THF solvent. This is mainly due to the synergy effect of TiCl 4 catalyst and THF solvent.
Highlights
Hydrogen has been attracted as a clean energy carrier
Srinivasan et al reported that the NaAlH4 synthesized with Ti catalyst in solvent shows better dehydrogenation property than that of sample prepared by dry milling method. [8]
NaAlH4 milled for 60 hr without catalyst showed no NaAlH4 peak in XRD and H2 pressure change
Summary
Hydrogen has been attracted as a clean energy carrier. One of the important issues in hydrogen usage is to establish safe and reliable hydrogen storage method [1]. Complex hydride is safer than the commercial storage methods storing the hydrogen in compressed or liquid form. Due to the large hydrogen storage capacities, complex hydride has been attracted in recent years [2,3]. The advantage of ball-milling method is it can directly prepare the catalysts doped NaAlH4. Effect of milling conditions such as pressure, temperature, and catalyst has been studied [4]. Anton studied various form of chloride catalysts in dehydrogenation step [6,7]. Srinivasan et al reported that the NaAlH4 synthesized with Ti catalyst in solvent shows better dehydrogenation property than that of sample prepared by dry milling method. High energy ball-milling method was used as a mechano-chemical synthesis of NaAlH4. The effect of each parameter has been interpreted through the H2 pressure change
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