...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Metallurgical and Materials Transactions >Kinetics of Chlorination and Carbochlorination of Vanadium Pentoxide
【24h】

Kinetics of Chlorination and Carbochlorination of Vanadium Pentoxide

机译：五氧化二钒的氯化和碳氯化动力学

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Kinetics of chlorination of V_2O_5 with Cl_2-air, Cl_2-N_2, and Cl_2-CO-N_2 gas mixtures have been studied by nonisothermal and isothermal thermogravimetric measurements. In the temperature range of 500 ℃ to 570 ℃, the chlorination of V_2O_5 with Cl_2-N_2 gas mixture is characterized by an apparent activation energy of about 235 kJ/mole. This could be attributed to chemical reaction. Between 570 ℃ and 650 ℃, the apparent activation energy is equal to 77 kJ/mole, indicating that the overall reaction rate is controlled by chemical reaction and pore diffusion. The reaction order with respect to chlorine is 0.78. The apparent activation energy of the carbochlorination of V_2O_5 by Cl_2-CO-N_2 gas mixture is about 100 kJ/mole in the temperature range of 400 ℃ to 620 ℃. In this case, the chemical reaction is the limiting step. At temperatures higher than 620 ℃, an anomaly is observed in the Arrhenius plot, probably due to thermal decomposition of COCl_2 formed in situ and/or transformation of the vanadium oxide physical state. The maximum reaction rate is obtained by using a Cl_2-CO-N_2 gas mixture having a Cl_2/CO volume ratio equal to about 1.
机译：通过非等温和等温热重法研究了用Cl_2-空气，Cl_2-N_2和Cl_2-CO-N_2气体混合物对V_2O_5进行氯化反应的动力学。在500℃至570℃的温度范围内，Cl_2-N_2混合气对V_2O_5的氯化反应具有约235 kJ / mol的表观活化能。这可以归因于化学反应。在570℃和650℃之间，表观活化能等于77 kJ / mol，表明整体反应速率受化学反应和孔扩散的控制。相对于氯的反应阶数为0.78。 Cl_2-CO-N_2混合气体对V_2O_5进行碳氯化反应的表观活化能在400〜620℃范围内约为100kJ / mol。在这种情况下，化学反应是限制步骤。在高于620℃的温度下，在Arrhenius图中观察到异常，这可能是由于原位形成的COCl_2的热分解和/或钒氧化物物理状态的转变所致。通过使用Cl_2 / CO体积比约为1的Cl_2-CO-N_2气体混合物获得最大反应速率。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号