北京大学学报(自然科学版)

在CeO2/SiO2催化剂上丁烯-1异构化动力学的内扩散影响

黄维,金韵,俞启全   

  1. 北京大学化学系,北京,100871
  • 收稿日期:1995-05-22 出版日期:1995-11-20 发布日期:1995-11-20

The Effect of Internal Diffusion on the Kinetics of Isomerization for Butene-1 over CeO2/SiO2Catalyst

HUANG Wei, YU Qiquan, JIN Yun   

  1. Department of Chemistry, Peking University, Beijing, 100871
  • Received:1995-05-22 Online:1995-11-20 Published:1995-11-20

摘要: 用外循环流动玻璃无梯度反应器研究了CeO2/SiO2催化剂上丁烯-1异构化动力学的内扩散影响。当用30~40目催化剂时丁烯-1异构化在动力学区域。当催化剂厚度增大到4mm时反应在内扩散区域进行。催化剂有效因子在0.058~0.12之间,说明内扩散影响严重。丁烯-1异构成c-2-丁烯的催化剂有效因子比丁烯-1异构成t-2-丁烯的要小。用Runge-Kutta方法计算了丁烯-1在催化剂孔内的分压分布。

关键词: CeO2/SiO2催化剂, 丁烯-1异构化, 内扩散影响

Abstract: The effect of internal diffusion on the kinetics of isomerization of butene-1 over CeO2/SiO2catalyst has been investigated in an external circulation gradientless reactor. The isomerization of butene-1 occurred in kinetic region with 30~40 mesh catalyst. When the thickness of catalyst was increased to 4mm, the reaction occurred in internal diffusion region. The effectiveness factors of catalyst were in the range of 0.058~0.12, indicating that the reaction was strongly affected by internal diffusion. The effectiveness factors for isomerization of butene-1 to trans-2-butene were larger than those for isomerization of butene-1 to cis-2-butene. The partial pressure profile of butene-1 in catalyst pore was calculated by the Runge-Kutta method.

Key words: CeO2/SiO2catalyst, isomerization of butene-1, effect of intraparticle diffusion

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