氢化镁放氢动力学的研究  

Hydrogen desorption kinetics of magnesium hydride

作　　者：张晓丽[1] 王乃飞[1] 李涛[1] 张倩倩[1] 周仕学[1] 

机构地区：[1]山东科技大学化学与环境工程学院,山东青岛266590

出　　处：《功能材料》2015年第9期9041-9044,共4页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(21176145)

摘　　要：无烟煤经碱熔-酸洗-碳化处理后制得了微晶碳,以微晶碳及肥煤作助磨剂,在氢气气氛下机械球磨金属镁3h,制得储氢材料氢化镁。在等温条件下用体积法进行放氢测试,根据放氢数据用Arrhenius方程计算出的放氢活化能为104.85kJ/mol。在变温条件下用程序升温脱附法测得材料的TPD曲线,用Kissinger方程和Sharp方程分别对材料的活化能进行计算。Kissinger方程求得的活化能为105.87kJ/mol;当升温速率为5,10和15℃/min时,Sharp方程求得的活化能分别为108.33,98.70和113.19kJ/mol。等温法和非等温法均可用于放氢活化能的计算,由于公式、原理、采用数据等方面的不同,求得的活化能有差异。The hydrogen storage material MgH2 was prepared by mechanical milling of magnesium under hydrogen atmosphere for 3hwith bituminous coal and crystallitic carbon which was prepared from anthracite coal by alkaline melting,acid rinsing treatment and carbonization,as milling aid.The volumetric method under the isothermal process was introduced in experiment of hydrogen desorption and the activation energy is calculated to be 104.85kJ/mol according to Arrhenius equation and the data of hydrogen desorption.TPD curves of the material under non-isothermal process were measured by temperature programmed desorption method and the activation energy was calculated by Kissinger equation and Sharp equation.The activation energy of hydrogen desorption is 105.87kJ/mol calculated by Kissinger equation according to TPD curves and it is 108.33,98.70and113.19kJ/mol at the heating rate 5,10 and 15℃/min,respectively.Both isothermal method and non-isothermal method can be used for the calculation of activation energy and the values are different because of that their equations,theories and the data they employed are different.

关 键 词：氢化镁 放氢 动力学 活化能 

分 类 号：TB139[理学—物理]