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3 h,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104．85 kJ/mol.在变温条件下用程序升温脱附法测得材料的TPD曲线,用Kis-singer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105．87 kJ/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113．19 kJ/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 hydro-gen atmosphere for 3 h with 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 iso-thermal process was introduced in experiment of hydrogen desorption and the activation energy is calculated to be 104.85 kJ/mol according to Arrhenius equation and the data of hydrogen desorption.TPD curves of the mate-rial under non-isothermal process were measured by temperature programmed desorption method and the acti-vation energy was calculated by Kissinger equation and Sharp equation.The activation energy of hydrogen de-sorption is 105.87 kJ/mol calculated by Kissinger equation according to TPD curves and it is 108.33,98.70 and 113.19 kJ/mol at the heating rate 5,10 and 15 ℃/min,respectively.Both isothermal method and non-isother-mal 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.
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