【摘要】：以改性無(wú)煙煤為助磨劑,在氫氣氣氛下球磨制備了具有納米結(jié)構(gòu)的鎂鋁合金儲(chǔ)氫材料,通過(guò)SEM,XRD,TPD等手段對(duì)比研究了球磨吸氫材料及靜態(tài)再吸氫材料的晶相結(jié)構(gòu)及放氫動(dòng)力學(xué)性能。結(jié)果表明:改性無(wú)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(dá)74nm;鎂鋁合金經(jīng)反應(yīng)球磨后,其中的Mg轉(zhuǎn)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(zhǎng)60%,Mg17Al12分解為單質(zhì)Mg和Al,其中單質(zhì)Al使儲(chǔ)氫材料放氫活化能降低,用Kissinger方程計(jì)算出球磨儲(chǔ)氫和再吸氫材料的放氫一級(jí)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(hào)：2280981