研究氯化盐对氢化燃烧合成法及机械球磨法(HCS+MM)制备的镁基氢化物水解制氢动力学性能的影响.XRD分析表明HCS法可成功制备高纯MgH2.水解性能测试表明在球磨过程中添加氯化盐有利于加快水解初期反应速率及增加60 min的制氢量.MgH2?10%NH4Cl复合物具有最好的水解性能,室温下水解60 min制氢量为1311 mL/g,转化率为85.69%.这可能是因为氯化盐在球磨过程中不仅起到了球磨助剂的作用,而且在活性材料上产生了新鲜表面,促进了水解反应.
The effects of chloride salts (NaCl, MgCl2 and NH4Cl) on the hydrolysis kinetics of MgH2 prepared by hydriding combustion synthesis and mechanical milling (HCS+MM) were discussed. X-ray diffraction (XRD) analyses show that high-purity MgH2 was successfully prepared by HCS. Hydrolysis performance test results indicate that the chloride salt added during the milling process is favorable to the initial reaction rate and hydrogen generation yield within 60 min. A MgH2?10% NH4Cl composite exhibits the best performance with the hydrogen generation yield of 1311 mL/g and a conversion rate of 85.69% in 60 min at room temperature. It is suggested that the chloride salts not only play as grinding aids in the milling process, but also create fresh surface of reactive materials, favoring the hydrolysis reaction.
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