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在初始压力15—30atm、温度20—85℃的范围内研究了储氢材料LaNi_5在恒温时吸氢的动力学过程.实验结果表明:吸氢量与时间的对数呈线性关系;吸氢速率随初始压力的提高或吸氢温度的升高而改变.提出了表示吸氢速率对时间、初始压力、吸氢温度依赖性的关系式,实验结果与之一致.按这一关系式可以得到吸氢速率的限制性环节的激活能U.在吸氢量(以饱和度计)约70%以前,U约为2.0 kcal/mol H_2,吸氢量更高时约3.2 kcal/mol H_2.这些数据为进一步确定吸氢速率的限制性环节提供了重要参数.
The kinetic process of hydrogen storage of LaNi_5 at constant temperature is studied in the range of initial pressure 15-30atm and temperature 20-85 ℃ .The experimental results show that the hydrogen absorption rate has a linear relationship with the logarithm of time and the hydrogen absorption rate With the increase of the initial pressure or the temperature of the hydrogen absorption changes.An expression of hydrogen rate on the time, the initial pressure, temperature dependence of hydrogen absorption, the experimental results consistent with this relationship can be obtained by suction The activation energy for the limiting part of the hydrogen rate U is about 2.0 kcal / mol H 2 for U about 70% hydrogen saturation (about saturation degree) and about 3.2 kcal / mol H 2 for the higher hydrogen absorption. It provides important parameters for further determination of the hydrogen absorption rate limit.