摘要
将LiAlH4和LiNH2按摩尔比1∶2进行球磨复合,然后将复合物进行加热放氢,对完全放氢后的产物进行再吸氢,系统研究了复合物放氢/再氢化行为.通过X射线衍射(XRD)、差示扫描量热法(DSC)和傅里叶变换红外光谱(FTIR)等测试手段对反应过程进行了分析.结果表明,LiAlH4/2LiNH2复合体系加热放氢分为3个反应阶段,放氢后生成Li3AlN2,总放氢量达到8.65%(质量分数).放氢生成的Li3AlN2在10 MPa氢气压力和400℃条件下,能可逆吸氢5.0%(质量分数),吸氢后的产物为LiNH2,AlN和LiH,而不再生成LiAlH.对LiAlH/2LiNH复合物放氢/再氢化过程机理进行了分析.
Mixture of LiAlH4and LiNH2 with a molar ratio of 1：2 was ball-milled to form Li-Al-N-H compo-site.The prepared composite was heated for dehydrogenation,and the fully dehydrogenated sample was re-hydrogenated.The dehydrogenation/re-hydrogenation processes were studied by means of XRD,DSC and FTIR analysis.The experimental results show that the dehydrogenation process of LiAlH4/2LiNH2 composite was a three-step reaction,and Li3AlN2 was finally formed after releasing 8.65%（mass fraction） hydrogen.Furthermore,the derived Li3AlN2 can be re-hydrogenated to LiNH2,AlN and LiH under conditions of 10 MPa H2 and 400 ℃,and 5.0%（mass fraction） hydrogen can be reversibly stored by Li3AlN2.The dehydrogenation/re-hydrogenation mechanism of LiAlH4/2LiNH2 composite was also discussed.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2011年第6期1330-1333,共4页
Chemical Journal of Chinese Universities
基金
国家自然科学基金(批准号:50671094)资助
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
Hydrogen storage material
Hydrogen storage property
Complex hydride
Chemical hydride
Metal-nitrogen-hydride
