【摘要】：以改性無煙煤為助磨劑,在氫氣氣氛下球磨制備了具有納米結構的鎂鋁合金儲氫材料,通過SEM,XRD,TPD等手段對比研究了球磨吸氫材料及靜態(tài)再吸氫材料的晶相結構及放氫動力學性能。結果表明:改性無煙煤具有良好的助磨作用,經(jīng)5.5h球磨,材料平均粒度可達74nm;鎂鋁合金經(jīng)反應球磨后,其中的Mg轉化成了β-MgH2和γ-MgH2,放氫峰溫低于300℃;靜態(tài)再吸氫后,MgH2全部以β-MgH2存在,且晶體粒度增長60%,Mg17Al12分解為單質Mg和Al,其中單質Al使儲氫材料放氫活化能降低,用Kissinger方程計算出球磨儲氫和再吸氫材料的放氫一級表觀活化能分別為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 緯-MgH2, hydrogen release peak temperature below 300 鈩，

本文編號：2280981