作　　者： ; ; ; ; ;

机构地区： 四川大学材料科学与工程学院

出　　处： 《功能材料》 2011年第4期704-707,共4页

摘　　要： 金属Mg和Al都是水解制氢原料的最佳候选之一,但存在制粉难、氢化难、产氢量低等问题。而金属间化合物Mg17Al12易粉化和氢化,并且氢化产物(MHA)的水解产氢量高达13.6%(质量分数)。研究了溶液pH值对Mg17Al12氢化物水解放氢性能的影响。结果表明,Mg17Al12氢化物只能在强酸溶液中才能放出理论氢量,在其它条件下只能实现部分水解放氢。而采用球磨的方法在MHA中添加盐也能显著地提高Mg17Al12氢化物的化学活性。研究结果表明,Mg17Al12氢化物与MgCl2质量比为1时,该复合物球磨1h后在70℃下水解反应1h后,产氢率达到90%。 Pure Mg or Al is one of the best candidates for hydrogen generation by hydrolysis,but it is hard for them to be pulverized and hydrogenated as well as their low yield of hydrogen.In comparison with pure Al or Mg,Mg17Al12 is a brittle intermetallic compound,which can be easily pulverized and hydrogenated,and the theoretical hydrogen yield by hydrolysis of the hydrogenated Mg17Al12 is as high as 13.6wt%.The effect of pH value on hydrogen generation by hydrolysis of Mg17Al12 hydride was investigated in this paper.The result showed that the hydrolysis reaction of Mg17Al12 hydride can only be completed in strong acid.The ball-milling process of Mg17Al12 hydride together with MgCl2 can effectively improve the reactivity of Mg17Al12 hydride.For the mixture of the mole ratio 1∶1 of MgCl2 to Mg17Al12 hydride which was milled for 1h before hydrolysis,the hydrogen yield reached 90%.

关 键 词： 氢化物 水解制氢 酸碱度 球磨

领　　域： [电气工程]