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中文摘要：
采用机械球磨法制备了Mg（BH4）2-NaNH2复合储氢材料,研究了Mg（BH4）2和NaNH2之间的相互作用及其加热放氢性能。当物质的量比为1∶2时,Mg（BH4）2与NaNH2之间发生反应：Mg（BH4）2＋2NaNH2→2NaBH4＋Mg（NH2）2。当物质的量比为1∶1时,Mg（BH4）2与NaNH2之间发生反应：Mg（BH4）2＋NaNH2→NaBH4＋MgBNH6。加热到400℃,该样品分两步进行放氢反应,放氢峰温分别在190℃和369℃,可以放出4.7%（质量分数）氢气。第一步放氢反应为MgBNH6分解产生MgH2,即：MgBNH6→MgH2＋BN＋2H2。第二步放氢反应为MgH2的分解：MgH2→Mg＋H2。
英文摘要：
Mg（BH4）2→NaNH2（molar ratio 1∶1and 1∶2）hydrogen storage composites were prepared by ball milling method.The interaction between Mg（BH4）2 and NaNH2 and the following dehydrogenation of composites have been investigated.For Mg（BH4）2-NaNH2 in a molar ratio of 1∶2,a metathesis reaction occurred during ball milling treatment：Mg（BH4）2＋2NaNH2→2NaBH4＋Mg（NH2）2.For the case of Mg（BH4）2-NaNH2 composite in a molar ratio of 1∶1,a new reaction was observed：Mg（BH4）2＋NaNH2→NaBH4＋MgBNH6.It has two steps for dehydrogenation with the peak temperatures at 190℃and 369℃,respectively.A total capacity of 4.7wt% hydrogen was released upon heating to 400 ℃.According to XRD tests,the decomposition of MgBNH6 is involved in the first step：MgBNH6→MgH2＋BN＋2H2.The second step is for the decomposition of MgH2：MgH2→Mg＋H2.
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