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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。
The Mg (BH4) 2-NaNH2 composite hydrogen storage material was prepared by mechanical ball milling. The interaction between Mg (BH4) 2 and NaNH2 and the performance of heating and de-hydrogenation were studied. When the mass ratio of material is 1: 2, the reaction between Mg (BH4) 2 and NaNH2 occurs: Mg (BH4) 2 + 2NaNH2 → 2NaBH4 + Mg (NH2) 2. When the mass ratio of material is 1: 1, the reaction between Mg (BH4) 2 and NaNH2 occurs: Mg (BH4) 2 + NaNH2 → NaBH4 + MgBNH6. Heating to 400 ℃, the sample was divided into two steps to carry out hydrogenation reaction, the hydrogen peak temperature were at 190 ℃ and 369 ℃, can release 4.7% (mass fraction) hydrogen. In the first step, the hydrogen desorption reaction is the decomposition of MgBNH6 to produce MgH2, namely: MgBNH6 → MgH2 + BN + 2H2. The second step, the hydrogen desorption reaction is the decomposition of MgH2: MgH2 → Mg + H2.