| LiAlH4与LiNH2的相互作用机理及储氢特性 |
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| 引用本文： | 任晓,王新华,李寿权,葛红卫.LiAlH4与LiNH2的相互作用机理及储氢特性[J].高等学校化学学报,2011,32(6):1330-1333. |
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| 作者姓名： | 任晓 王新华 李寿权 葛红卫 |
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| 作者单位： | 浙江大学材料系, 杭州 310027 |
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| 摘 要： | 将LiAlH4和LiNH2按摩尔比1：2进行球磨复合，随后将复合物进行加热放氢特性研究，然后对其完全放氢后的产物进行再吸氢特性研究。通过X射线衍射分析(XRD)、热分析(DSC)和红外 (FTIR)分析等测试手段对其反应过程进行了系统分析研究。研究结果表明，LiAlH4/2LiNH2加热放氢分为3个反应阶段，放氢后生成Li3AlN2，总放氢量达到8.65wt%。放氢生成的Li3AlN2在10MPaH2压力和400℃条件下，可以可逆吸氢5.0wt%，吸氢后的产物为 LiNH2 、AlN和LiH，而不能再生成LiAlH4。本文对LiAlH4/2LiNH2复合物放氢/再氢化过程机理进行了分析。
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| 关 键 词： | 储氢材料 储氢性能 配位氢化物 化学氢化物 金属氮氢化物 |
| 收稿时间： | 2011-01-24 |
Reaction Mechanism and Hydrogen Storage Properties of LiAlH4 and LiNH2 |
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| REN Xiao,WANG Xin-Hua,LI Shou-Quan,GE Hong-Wei.Reaction Mechanism and Hydrogen Storage Properties of LiAlH4 and LiNH2[J].Chemical Research In Chinese Universities,2011,32(6):1330-1333. |
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| Authors: | REN Xiao WANG Xin-Hua LI Shou-Quan GE Hong-Wei |
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| Abstract: | LiAlH4 and LiNH2 was ball milled at molar ratio of 1:2, thus prepared composite was heated for dehydrogenation, the fully dehydrogenated samples were re-hydrogenated. The dehydrogenation/re-hydrogenation processes were studied by means of XRD, DSC and FTIR analysis. The experimental results showed that the dehydrogenation process of LiAlH4/2LiNH2 composite is a three-stage reaction, and Li3AlN2 was formed after releasing 8.65wt% of hydrogen。The derived Li3AlN2 can be re-hydrogenated under conditions of 10MPaH2 and 400℃, and LiNH2 、AlN and LiH were formed. The reversible hydrogen storage capacity reached 5.0wt%. The dehydrogenation/re-hydrogenation mechanism of LiAlH4/2LiNH2 composite was discussed. |
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| Keywords: | Hydrogen storage materials Hydrogen storage properties Complex hydride Chemical hydride Metal-nitrogen-hydride |
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