Mg2NiH4对高氯酸铵热分解过程的影响

采用置换-扩散法制备了储氢材料Mg2NiH4, 用XRD, ICP和DSC-TG方法对其结构进行了表征. 用热分析法(DSC)研究了Mg2NiH4对高氯酸铵(AP)热分解过程的影响. 研究结果表明, Mg2NiH4对AP热分解过程有较大影响. Mg2NiH4可以显著促进AP的低温热分解过程, 降低高温热分解温度, 使DSC表观分解热明显增大. 随着加入量的增加, Mg2NiH4对AP热分解的催化促进作用增强, 当Mg2NiH4加入的质量分数为30％时, DSC表观分解热最大. 吸氢量越大, 储氢材料对AP的催化促进作用越强. Mg2NiH4催化促进AP分解过程的作用机理为: Mg2NiH4分解释放的H2及Mg和Ni与AP分解产物发生反应.

Effect of Mg2NiH4 on the Thermal Decomposition of Ammonium Perchlorate

Magnesium-based hydrogen storage material Mg2NiH4 was prepared with replacement-diffusion method and its structure was determined by XRD,ICP and DSCTG.The thermal decomposition behavior of ammonium perchlorate(AP) was investigated in the presence of Mg2NiH4 by the method of DSC.The results show that Mg2NiH4 had obvious influence on the thermal decomposition of AP.Mg2NiH4 showed an evident catalytic effect on the lower temperature thermal decomposition of AP,and the higher thermal decomposition temperature of AP was decreased by Mg2NiH4,with a clear increase at DSC heat release.The catalytic effect of Mg2NiH4 on the thermal decomposition of AP was enhanced with the increase in content,and the DSC heat release was at its biggest value when the content of Mg2NiH4 was 30%(mass fraction).With the increase of hydrogen storage,the catalytic effect became stronger.The mechanism of catalyzing the thermal decomposition of AP is as follows: H2 released from Mg2NiH4 and Mg, Ni reacted with the decomposed product of AP.