Catalytic effect of Al3Ti on the reversible dehydrogenation of NaAlH4

Al(3)Ti was directly utilized as catalyst precursor to examine its catalytic activity in the reversible dehydrogenation of NaAlH(4). It was observed that Al(3)Ti possessed considerable catalytic effect on the de-/hydriding reactions of NaAlH(4). The catalytic enhancement by Al(3)Ti doping significantly increased with increasing ball-milling time. Moreover, it was noted that dehydriding kinetics and cycling performance of the Al(3)Ti-doped NaAlH(4) were highly dependent on the starting material, 1:1 NaH/Al mixture or NaAlH(4). The combined property and phase examinations suggest that Al(3)Ti may act as active species to catalyze the reversible de-/hydrogenation of NaAlH(4). (c) 2006 Published by Elsevier B.V.