(329b) Secondary Effectiveness Factors for Catalytic Reactions in Series: A Unified Extension to Slab, Cylinder, and Spherical Geometries

Thiele moduli and effectiveness factors are powerful ways to factor for diffusion limitations in heterogeneously catalyzed reactions. They have been developed for different rate laws, different geometries, as well as non-isothermal reactions. A recent study [Peters et al., ACS Catal, 2020, 10, 7, 4319- 4325] reported new ’secondary’ effectiveness factors for a series of catalytic reactions A → B → C in a slab geometry. This paper generalizes the secondary effectiveness factors to spherical and cylindrical geometries. We illustrate their use for a batch slurry reactor with catalyst particles of different geometry. For molecular sieves, we show how partition coefficients between the solution and the catalyst particle can enhance the selectivity to intermediate B. Finally, we introduce generalized expressions for the concentration of B and the ’secondary’ effectiveness factor for different geometries.