The Study Of Synthetic Method For Aluminum Hydride

The traditional energy is limited and non-renewable, so that the traditional energyis serious shortage after human’s long-term industrial development. To seek newsources of energy is becoming a hot spot of modern academic research. Hydrogenenergy is widespread, recycled, abundant, good combustion performance and clean, andwe have a lot of attention about it. The key to use hydrogen energy is how to storehydrogen. The high hydrogen content (10.01%) and easy to release hydrogen（about100℃）makes AlH3becoming the good candidate for the hydrogen storage materials.Different from the traditional synthesis methods of AlH3, the alkyl aluminium hydridewas used to catalyze activated aluminium for direct synthesis AlH3. The low thermalsolid-phase of synthesis AlH3has been used for the preliminary study. The starting pointof our experiment is to get rid of reliancing on organic reagents. Our solution reducesthe synthetic cost and does not cause environmental pollution. A green route tosynthesize AlH3is discovered and it is meaningful for studying AlH3.The high energy mechanical ball milling was used to preparation highly activatedaluminum with Ti powder, A and B. The content of Ti is0.41%and the averagediameter of aluminium powder is21.3nm. We obtained high activity of aluminumpowder after the samples were characterized by XRD, TG and SEM. LiAlH4andEt2AlCl were used to to synthesize Et2AlH. Me3Al and LiAlH4were used to tosynthesize Me2AlH. The high purity Et2AlH and Me2AlH were obtained by beingcharacterized by1HNMR.AlH3was synthesized by alkyl aluminium hydride and activated aluminum underhydrogen condition. The hydrogen pressure is8-13MPa and the reaction time is3-21h.We used XRD to characterizate the samples. An experimental facility was designed tomeasure hydrogen content of the samples.LiH and AlCl3were used to to synthesize AlH3under the condition of lowtemperature. The mole ratio, reaction temperature and reaction time are10:1,85℃,90℃and1-4h. LiAlH4and AlCl3were used to synthesize AlH3under the condition oflow temperature. The reaction temperature is75℃. LiAlH4and AlCl3were used to tosynthesize AlH3under the condition of grinding. The mole ratio, reaction temperatureand reaction time are4:1,75℃and3h. We used XRD to characterizate the samples.It indicates that we had successfully obtained non-AlH3.