3LiBH_4/CeF_3体系的放氢性能及机制  

Dehydrogenation Property and Mechanism of 3LiBH_4/CeF_3 System

作　　者：顾润 张明[1] 王春阳[1] 黄维军[1] 柳东明[1] 

机构地区：[1]安徽工业大学材料科学与工程学院,马鞍山243002

出　　处：《高等学校化学学报》2016年第4期688-692,共5页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:51371008)资助~~

摘　　要：采用球磨法制备了3LiBH_4/CeF_3反应体系,通过压力-组成-温度(PCT)测试仪、X射线衍射仪(XRD)和傅里叶变换红外光谱仪(FTIR)研究了体系的放氢性能、反应机制及性能改善机理.结果表明,3LiBH_4/CeF_3体系在295℃左右快速放氢,总放氢量为4.1%(质量分数).放氢过程中CeF_3与Li BH4直接发生反应:3LiBH_4+CeF→31/2Ce B6+1/2CeH2+3LiF+11/2H2.与纯Li BH4相比,放氢热力学稳定性和表观活化能的降低是3LiBH_4/CeF_3体系放氢温度下降的主要原因.The 3LiBH4/ CeF3 reactive system was prepared by ball-milling treatment. Its dehydrogenation property and reaction as well as the property improvement mechanism were investigated by pressure-composition-temperature（ PCT） analyser,X-ray diffractometer（ XRD） and Fourier transform infrared spectrometer（ FTIR）. It was found that the 3LiBH4/ CeF3 system fast released hydrogen at about 295 ℃ with about 4. 1%（ mass fraction） of hydrogen totally desorbed. During the dehydrogenation process,CeF3 reacted directly with Li BH4 according to the reaction 3LiBH4＋ Ce F3→1 /2Ce B6＋ 1 /2Ce H2＋ 3LiF ＋ 11 /2H2. In comparison with pristine Li BH4,the decrease in dehydrogenation thermodynamic stability and apparent activation energy are the main reasons for the declined dehydrogenation temperature of the 3LiBH4/ CeF3 system.

关 键 词：硼氢化锂 氟化铈 放氢性能 放氢机制 

分 类 号：O643[理学—物理化学]