화학공학소재연구정보센터
International Journal of Hydrogen Energy, Vol.24, No.5, 461-465, 1999
Advanced titanium doping of sodium aluminum hydride: segue to a practical hydrogen storage material?
The dehydrogenation kinetics of NaAlH4 have been enhanced far beyond those previously achieved upon titanium doping of the host hydride. Homogenization of NaAlH4 with 2 mole % Ti(OBun)(4) under an atmosphere of argon produces a novel material which contains only traces of carbon. TPD measurements show that the dehydrogenation of this material occurs about 30 degrees C lower than that previously found for NaAlH4 doped with titanium through wet chemistry methods. The novel titanium containing material can be rehydrided under 1600 psi of hydrogen pressure at 200 degrees C. In further contrast to 'wet doped' NaAlH4, the dehydrogenation kinetics observed for the novel material are undiminished over several dehydriding/hydriding cycles.