Abstract: The effect of intraparticle diffusion of catalyst has been investigated in a flow-recirculation glass reactor. The reaction of oxidative dehydrogenation of butene-2 occurred in the kinetic regime over 30-40 mesh Mo3.0 Bi0.9Ce1.1/ SiO2 catalyst. When the particle size of catalyst increased to 5-14 mesh, the reaction of oxidative dehydrogenation of butene-2 occurred in the regime of intraparticle diffusion. The effect of intraparticle diffusion of catalyst increased with the rise of reaction temperature. At 753K, the measured value of catalytic effectiveness factor was 0. 20. The effects of intraparticle diffusion on activation energies of reduction of catalyst by butene-2 and reoxidation of reduced catalyst were measured experimentally. The value of activation energy for butene-2 when intraparticle diffusion controls, is equal to the mean of the activation energy in both the kinetic and the diffusion regime. The effects of intraparticle diffusion on the selectivity of butadiene were investigated. An empirecal equation was set up to represent the effects of intraparticla diffusion on the selectivity of butadiene.

摘要： 用玻璃流动外循环无梯度反应器研究了Mo—Bi—Ce/SiO_2催化剂上丁烯-2氧化脱氢的内扩散影响.确定了催化剂的有效因子,多孔催化剂的有效因子随反应温度的升高而减小.在内扩散区域的反应活化能为丁烯-2扩散活化能、动力学区域反应活化能的算术平均值.在内扩散区域的丁烯氧化脱氢生成丁二烯的选择性用经验式描述.