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为改善LiAlH4和LiNH2的储氢性能,将两者混合球磨制备LiAlH4/LiNH2复合体系,并添加TiF3和Ti作为复合体系催化剂。采用DSC、TG、XRD和储氢特性测定等手段研究催化剂TiF3和Ti对LiAlH4/LiNH2复合体系储氢性能的影响。结果表明:添加Ti和TiF3可显著改善Li-Al-N-H储氢体系的放氢动力学性能、提高放氢总量和降低体系的放氢温度。添加5%(摩尔分数,下同)TiF3催化剂后,LiAlH4/LiNH2复合体系球磨过程放氢量由1.27%(质量分数,下同)增加到1.69%,总放氢量由5.95%增加到6.85%。起始放氢温度由150℃降低到75℃。
In order to improve the hydrogen storage capacity of LiAlH4 and LiNH2, LiAlH4 / LiNH2 composite system was prepared by ball milling both of them and TiF3 and Ti were added as catalyst. The effects of TiF3 and Ti on the hydrogen storage properties of LiAlH4 / LiNH2 composite were investigated by DSC, TG, XRD and hydrogen storage properties. The results show that the addition of Ti and TiF3 can significantly improve the hydrogen-releasing kinetics of Li-Al-N-H hydrogen storage system, increase the total amount of hydrogen desorption and decrease the hydrogen desorption temperature. Adding 5% (mole fraction) of TiF3 catalyst, the amount of hydrogen released from ball milling in LiAlH4 / LiNH2 composite system increased from 1.27% (mass fraction) to 1.69% and the total hydrogen release from 5.95% to 6.85% . The initial hydrogen evolution temperature is reduced from 150 ° C to 75 ° C.