金属Ce氢化-氮化反应动力学

以金属Ce为原料，对Ce氢化-氮化动力学参数进行研究，分别考察了初始反应温度、原料气体初始压力和Ce片厚度等对金属Ce氢化-氮化反应的影响。研究结果表明：升高初始反应温度有利于缩短氢化过程的诱导时间，但对氢化反应速率无明显影响；提高H₂初始压力和降低片层厚度能明显加快氢化反应速率。此外，通过X射线衍射（XRD）和扫描电镜（SEM）等表征证明氢化铈可以与N₂反应得到氮化铈（CeN）和H₂，但反应需要较高的温度以克服活化能，增加初始反应温度和N₂初始压力可以提高反应速率。综合考虑，初始反应温度为350 ℃、N₂初始压力为60 kPa是氢化铈氮化的较优条件。

Reaction Kinetics in Hydriding-Nitriding of Metallic Cerium

The metallic cerium was employed as raw material to investigate the parameters of reaction kinetics in hydriding-nitriding reaction. The influence of initial reaction temperature, initial gas pressure and the thickness of cerium in hydriding-nitriding of metallic cerium were investigated. The results show that the increased initial reaction temperature is in favor of shortening induction period in hydriding process, but has no remarkable influence in reaction rate of hydriding process. With the increasing of H₂ initial pressure and decreasing of the thickness of cerium, the reaction rate is significantly enhanced. Furthermore, as proved by XRD, SEM and other characterization, the cerium hydride reacts with N₂ and gets cerium nitride and H₂. The initial reaction temperature and initial N₂ pressure accelerate the nitriding reaction successfully. As a result, an initial reaction temperature of 350 ℃ and an initial N₂ pressure of 60 kPa are chosen as the relatively optimal conditions proposed for the nitriding of cerium hydride.