碳助磨制备纳米镁铝储氢合金的结构及储氢性能研究
发布时间：2018-10-19 11:28
【摘要】：以改性无烟煤为助磨剂,在氢气气氛下球磨制备了具有纳米结构的镁铝合金储氢材料,通过SEM,XRD,TPD等手段对比研究了球磨吸氢材料及静态再吸氢材料的晶相结构及放氢动力学性能。结果表明:改性无烟煤具有良好的助磨作用,经5.5h球磨,材料平均粒度可达74nm;镁铝合金经反应球磨后,其中的Mg转化成了β-MgH2和γ-MgH2,放氢峰温低于300℃;静态再吸氢后,MgH2全部以β-MgH2存在,且晶体粒度增长60%,Mg17Al12分解为单质Mg和Al,其中单质Al使储氢材料放氢活化能降低,用Kissinger方程计算出球磨储氢和再吸氢材料的放氢一级表观活化能分别为107.3kJ/mol和67.1kJ/mol。
[Abstract]:Magnesium aluminum alloy hydrogen storage materials with nano structure were prepared by ball milling in hydrogen atmosphere with modified anthracite as grinding aids. The crystal phase structure and hydrogen desorption kinetics of ball milling hydrogen absorbing materials and static rehydrogen absorbing materials were compared by SEM,XRD,TPD and other methods. The results show that the modified anthracite has good grinding aid, the average particle size of the modified anthracite can reach 74 nm after 5.5 h ball milling, the Mg of the modified anthracite is transformed into 尾-MgH2 and 纬-MgH2, hydrogen release peak temperature below 300 鈩，
本文编号：2280981
[Abstract]:Magnesium aluminum alloy hydrogen storage materials with nano structure were prepared by ball milling in hydrogen atmosphere with modified anthracite as grinding aids. The crystal phase structure and hydrogen desorption kinetics of ball milling hydrogen absorbing materials and static rehydrogen absorbing materials were compared by SEM,XRD,TPD and other methods. The results show that the modified anthracite has good grinding aid, the average particle size of the modified anthracite can reach 74 nm after 5.5 h ball milling, the Mg of the modified anthracite is transformed into 尾-MgH2 and 纬-MgH2, hydrogen release peak temperature below 300 鈩，
本文编号：2280981
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