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以化学合成-共沉淀还原法合成了富镧MMNi_5(MM=混合稀土金属)金属间化合物,并对经过充分活化的样品在α相区的吸氢动力学行为进行了研究。在氢初压为10.13～81kPa、温度为313～393K范围内测定了吸氢量与时间、压力、温度的依赖关系。根据动力学数据,计算出吸氢过程的表观激活能为5.02kJ/molH_2,并根据吸氢量与压力的关系,初步确定了在α相区吸氢速率限制性环节为表面过程,吸氢速率方程可表示为:dn/dt=Ke~(-E/RT)·P_01/t其中K为常数,P_0为初始氢压,t为反应时间。
The lanthanum-enriched MMNi_5 (MM = mischmetal) intermetallic compound was synthesized by chemical synthesis-coprecipitation reduction method and the hydrogen absorption kinetics of the fully activated sample in the α phase region was studied. The dependence of hydrogen absorption amount on time, pressure and temperature was measured at a hydrogen initial pressure of 10.13 ~ 81kPa and a temperature of 313 ~ 393K. According to the kinetic data, the apparent activation energy of the hydrogen absorption process is calculated to be 5.02 kJ / molH 2. According to the relationship between the hydrogen absorption capacity and the pressure, the hydrogen absorption rate limiting step in the α phase region is determined as the surface process, The rate equation can be expressed as: dn / dt = Ke ~ (-E / RT) · P_01 / t where K is a constant, P_0 is the initial hydrogen pressure, and t is the reaction time.