Abstract

A catalyst grain in a fixed-bed reactor is surrounded by an non-uniform flow because the reactant concentration changes as the reaction mixture moves through the bed. A problem was considered in which a spherical grain is in an non-uniform flow with a linear dependence of the reactant concentration on the longitudinal coordinate of the reactor in the presence of pore-diffusion resistance in the catalyst grain. For a first-order reaction, an analytical solution for the reactant concentration distribution within the grain was obtained. It was shown that, in comparison with a grain in a uniform flow, the reactant concentration increases in the frontal hemisphere of the grain and decreases in its rear hemisphere, and the grain performance remains unchanged because the increase in the reaction rate in the frontal hemisphere is compensated by its decrease in the rear hemisphere.

中文翻译：

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存在孔扩散阻力的情况下流动不均匀性对催化剂颗粒化学过程的影响

摘要

固定床反应器中的催化剂颗粒被不均匀流动包围，因为随着反应混合物移动通过床，反应物浓度会发生变化。考虑了这样的问题，其中在催化剂颗粒中存在抗孔扩散性的情况下，球形颗粒处于不均匀流动中，并且反应物浓度与反应器的纵向坐标呈线性关系。对于一级反应，获得了颗粒内反应物浓度分布的分析溶液。结果表明，与均匀流动的谷物相比，反应物的浓度在谷物的前半球增加而在其后半球减少，