给吸筑反应动力学研究.PDF

CNIC-01953 CAEP-0224 给吸筑反应动力学研究 那文增龙兴贵朱祖良 (中国工程物理研究院核物理与化学研究所，绵阳，621900) 摘要 利用金属氢化物热力学和动力学参数测试实验系统，通过反应 速率分析方法，测定了给在恒容系统和 573873 K 温度范围内氛化 反应的压强一时间变化关系，计算出给在初始压强 13 kPa 和 573 K , 673 K , 773 K , 873 K 温度下吸氛反应的速率常数分别为 O. 053 0 s-1 , 0.045 2 s-1 , 0.0319 S-l 和 0.026 1 S-l ，进而得到给吸氛反应表 1 观活化能为 (-10. 1 土 1. 5) kJ • mo 1- 0 与同一装置上取得的铁氛 化反应结果进行了比较，说明两个反应的动力学机制不同，给氛化反 应速率主要受相变和表面过程控制o 关键词:给氛动力学表观活化能 37 Kioetic Studies 00 the Hafoium aod Deuterium Cln Chinese) BING Wenzeng LONG Xinggui ZHU Zuliang Clnstitute of Nuclear Physics and Chemistry , CAEP , Mianyang , 621900) ABSTRACT Through the method of reaction rate analysis in a constant volume reactor , the time dependence of the pressure drop of the hafnium deuteride formation are studied over a temperature range 573 r-...- 873 K on a metal hydride thermodynam- ic and kinetic parameters measuring apparatus. The rate constants of the hafni- um deuteride formation , which are O. 053 0 S-l , O. 045 2 S-l , O. 031 9 S-l , 0.026 1 S-l , are calculated at a serial temperatures of 573 K , 673 K , 773 K , 873 K and the initial pressure of 13 kPa. The activation energy of the reaction is C-10.1 士1. 5) kJ • mol- 1 • Comparing the above results with those of titanium deuteride formation on the same measuring apparatus , the kinetic mechanism of the deuteride formation of hafnium and titanium is considerd different. It is concluded that the reaction rate of hafnium absorbing deuterium may be con- tr