Hydrolysis of ball milling Al-Bi-hydride and Al-Bi-salt mixture for hydrogen generation

In this paper, an effective method to produce hydrogen via the hydrolysis of the milled Al-Bi-hydride (or salts) in pure water at room temperature has been found. The result shows that the Al-Bi-hydrides (or salts) prepared by 5 It milling appear very effective to improve their hydrolysis reactivity. And the milled Al-Bi-hydrides (or salts) have high hydrogen yield in pure water, especially the Al-10 wt.% Bi-10 wt.% MgH2 mixture or Al-10 wt.% Bi-10 wt.% MgCl2 mixture all can produce 1050 ml/g within 5 min. The improvement mainly comes from three factors: (1) the additives (MgH2, CaH2, LiCl, MgCl2, KCI, etc.) play an important role to decrease the mean size of the mixture particles; (2) the exothermic dissolution of the salt additive such as MgCl2 Can increase the temperature of aqueous solution, favoring the reaction between Al-Bi composite and water; (3) the hydrolysis of the additives can also offer conductive ions on the work of the micro-galvanic cell of Al-Bi composite. Furthermore, the high conductive ions around the Al-Bi composite are the uppermost effect for increasing the hydrogen yield and hydrogen generation rate. (C) 2007 Elsevier BX All rights reserved.