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在动态过程中,催化剂表面上的吸附物种浓度随时间而变化,从而可以获得稳态流动法所不能提供的信息.本文提出了应用变更反应柱与色谱柱长度比的方法来计算反应物峰矩值的催化反应色谱技术,利用它可以在考虑所有传递过程影响和无需单一速率控制步骤假设的情况下分离地测量吸附和表面反应速率.本文对各传递过程对动力学参数计算值的影响作了考察,结果指出,轴向扩散和膜扩散在相当宽范围内取值只对吸附速率常数稍有影响而对吸附平衡常数及表面反应速率常数基本无影响.粒内有效扩散对后两者只有轻微的影响而对前者有一定影响.因此说明为测量吸附和表面反应速率无需很精确的传递过程系数值,为实验研究提供了方便.
In the dynamic process, the concentration of adsorbed species on the catalyst surface changes with time, and thus can obtain steady-state flow method can not provide information.This paper presents the application of the method of changing the length of the reaction column and column length ratio to calculate the peak reactant Value catalytic reaction chromatography technique that allows for the separate measurement of adsorption and surface reaction rates taking into account the effects of all transport processes and without the need for a single rate control step assumptions. The effect of each transfer on the calculated values of kinetic parameters The results show that the axial diffusion and membrane diffusion in a very wide range of values only slightly affect the adsorption rate constant adsorption equilibrium constant and the surface reaction rate constant has little effect on the effective diffusion within the grain of the latter two only slightly Of the impact on the former have a certain impact.Therefore, indicating that the adsorption and the surface reaction rate without the need for very accurate transfer process coefficient values for the experimental study provides a convenient.