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

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