Influence of TiC catalyst on absorption/desorption behaviors and microstructures of sodium aluminum hydride  

TiC催化剂对铝氢化钠吸放氢行为和微观结构的影响(英文)

作　　者：陈立新[1] 范修林[1] 肖学章[1] 薛晶文[1] 李寿权[1] 葛红卫[1] 陈长聘[1] 

机构地区：[1]浙江大学材料科学与工程学系,杭州310027

出　　处：《Transactions of Nonferrous Metals Society of China》2011年第6期1297-1302,共6页中国有色金属学报（英文版）

基　　金：Project(2010CB631300)supported by the National Basic Research Program of China;Projects(50871099,51001090)supported by the National Natural Science Foundation of China;Projects(20080440196,200902622)supported by the China Postdoctoral Science Foundation;Project(20090101110050)supported by the University Doctoral Foundation of the Ministry of Education,China

摘　　要：TiC-doped NaA1H4 complex hydrides were prepared by hydrogenation of ball-milled Nail/A1 mixture with x TiC powder （x = 0, 5%, 8%, 10%, mole fraction）. The effects of TiC catalyst content on the absorption/desorption behaviors of the samples were investigated. The results show that TiC can improve the hydriding/dehydriding kinetics of sodium aluminum hydride, the hydriding rate of the sample increases with increasing TiC content. It is found that the TiC-doped NaA1H4 composites have a relatively good cyclic stability. The composite doped with 10% TiC maintains steadily about 4.5% （mass fraction） hydrogen absorption capacity as against about 3.8% （mass fraction） hydrogen desorption capacity over 8 cycles. The particle sizes of the TiC-doped NaA1H4 composites can be reduced to 50-100 nm, which may play an important role in improving the hydriding/dehydriding kinetics.采用氢化NaH/Al+xTiC(x=0,5%,8%,10%,摩尔分数)混合物的方法制备TiC掺NaAlH4配位氢化物,系统研究TiC催化剂含量对样品吸放氢行为的影响。结果表明:TiC能有效改善铝氢化钠的吸放氢动力学性能,样品的加氢速率随着TiC含量的增加而提高;TiC掺NaAlH4复合物具有良好的吸放氢循环稳定性,掺杂10%TiC(摩尔分数)的NaAlH4复合物经过8次吸放氢循环后,其吸、放氢容量仍可稳定保持为4.5%和3.8%(质量分数);TiC掺NaAlH4复合物的颗粒尺寸可降低到50-100nm,这对改善体系吸放氢反应动力学起到主要作用。

关 键 词：hydrogen storage material sodium alanate TiC catalyst kinetic property ball milling 

分 类 号：TB34[一般工业技术—材料科学与工程]