THE EFFECTS OF HALIDE MODIFIERS ON THE SORPTION KINETICS OF THE LI-MG-N-H SYSTEM
THE EFFECTS OF HALIDE MODIFIERS ON THE SORPTION KINETICS OF THE LI-MG-N-H SYSTEM
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DOI：
10.1016/j.ijhydene.2011.07.046
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发表时间：
2012-02
影响因子：
7.2
通讯作者：
C. Price;J. Gray;R. Lascola;D. Anton
中科院分区：
文献类型：
--
作者：
C. Price;J. Gray;R. Lascola;D. Anton
研究了不同过渡金属卤化物(TiCl3、VCl3、ScCl3和NiCl2)对摩尔比为1：1的LiNH2和MgH2吸附性能的影响。改性后的混合物中含有LiNH_2、MgH_2和LiCl。TGA结果表明，改性剂的加入降低了放氢温度，其顺序为：TiCl3>；ScCl3>；VCl3>；NiCl2。氨的释放没有明显减少，导致重量损失大于材料的理论储氢容量。与未改性体系相比，改性体系的等温吸附动力学在第一次脱氢循环后几乎没有改善，但在再加氢循环中有明显的改善。X射线衍射和拉曼光谱分析表明，循环产物由LiH、MgH_2、Mg(NH_2)_2和Mg_3N_2组成。
The effects of different transition metal halides (TiCl3, VCl3, ScCl3and NiCl2) on the sorption properties of the 1:1 molar ratio of LiNH2to MgH2are investigated. The modified mixtures were found to contain LiNH2, MgH2and LiCl. TGA results showed that the hydrogen desorption temperature was reduced with the modifier addition in this order: TiCl3> ScCl3> VCl3> NiCl2. Ammonia release was not significantly reduced resulting in a weight loss greater than the theoretical hydrogen storage capacity of the material. The isothermal sorption kinetics of the modified systems showed little improvement after the first dehydrogenation cycle over the unmodified system but showed drastic improvement in rehydrogenation cycles. X-ray diffraction and Raman spectroscopy identified the cycled material to be composed of LiH, MgH2, Mg(NH2)2and Mg3N2.