The Study On Al-base Hydrogen Production Materials With High Active

In this thesis, a series of Al-base composites have been prepared by ball milling. Theproducing hydrogen performances of the Al-base composites in pure water were evaluatedthrough drainage method at room temperature. The effects of ball milling conditions anddoping agents on producing hydrogen performances of the composites were studied.Al-SnCl₂and Al-CuCl composites have been prepared. The performances of hydrogengeneration by the reaction of Al with pure water were studied for these composites. Theresults show that the Al-SnCl₂composite possesses higher generation hydrogen rate （1986ml/g min, at25oC） than that of Al-CuCl composite. The effects of ball milling time andcontent of SnCl₂on hydrogen generation property were discussed. The reaction mechanismbetween Al-SnCl₂and H2O were investigated by XRD, DSC and pH meter during reactionprocess.The Al-SnCl₂composites have high generation hydrogen rate. However, its conversionyield is relatively low. In order to improve the conversion yield, Al-SnCl₂-M （Zn, Ti, Cr, Bi,Mg and Ga） composites were prepared. The results show that it is beneficial to enhance theconversion yield （ca.98.9%） by doping metal Bi into the Al-SnCl₂composite. The effect ofball milling condition and content of Bi on hydrogen generation performances were discussed.The reaction mechanism between Al-SnCl₂-Bi and H2O were investigated by XRD and pHmete during reaction process.Combining NaBH₄and LiAlH₄with better hydrogen storage properties, the Al rawmaterials, Al-NaBH₄or Al-LiAlH₄composites were prepared, respectively. The generatinghydrogen performances of Al-NaBH₄or Al-LiAlH₄composites were discussed. The resultsshow the Al-LiAlH₄composite has better generation hydrogen rate and generation yield thanthose of Al-NaBH₄composite. The effects of LiAlH₄content and ball milling time onhydrogen generation property were discussed. The mechanism of the reaction of Al-LiAlH₄and H2O was investigated by XRD, micro-calorimetry.Al-based composites can react with H2O at room temperature and release hydrogen. Itcan provide the hydrogen for micro fuel cells. The hydrogen generation from Al-SnCl₂composites can drive electric fan, etc. to work. It is very promising for in-situ applications ofdifferent users.