在CeO＿2／SiO＿2催化剂上丁烯－1异构化动力学的内扩散影响

The Effect of Internal Diffusion on the kinetics of Isomerization for Butenelover CeO_2/SiO_2 Catalyst

用外循环流动玻璃无梯度反应器研究了ＣｅＯ＿２／ＳｉＯ＿２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。

The effect of internal diffusion on the kinetics of isomerization of butene-l over CeO_2/SiO_2 catalyst 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 4 mm,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 hinternal 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.