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用30—40目Pt/Al_2O_3催化剂时,乙醇深度氧化动力学可用乙醇,O_2及CO_2吸附L-H动力学方程描述。当催化剂粒度增大至4×2mm时,内扩散强烈地影响乙醇深度氧化速度。用动力学方法测定了O_2有效扩散系数。用Adams显示方法计算了在催化剂孔内O_2的压力分布。测定了乙醇深度氧化内扩散活化能,并将内扩散对活化能的影响用方程(10)解释。在动力学和内扩散区域,0_2的反应级数都接近一级。由实验测定的催化剂有效因子可用方程(11)估计。
With 30-40 mesh Pt / Al_2O_3 catalyst, the kinetics of ethanol oxidation can be described by L-H kinetics of ethanol, O_2 and CO_2 adsorption. When the catalyst particle size increased to 4 × 2mm, the internal diffusion strongly influenced the depth of oxidation of ethanol. The effective diffusion coefficient of O_2 was determined by kinetic method. The Adams method was used to calculate the pressure distribution of O_2 in the catalyst pores. The activation energy for deep oxidation of ethanol was determined, and the effect of internal diffusion on activation energy was explained by equation (10). In the kinetic and inner diffusion regions, the reaction order of 0_2 is close to one order. The experimentally determined catalyst effective factor can be estimated using equation (11).