Journal
CATALYSIS TODAY
Volume 411, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.cattod.2022.09.015
Keywords
Photocatalytic pellets; Core-shell particles; Chemical reactors; Reaction-diffusion equation
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This study derived governing equations for photocatalytic batch reactors and CSTR (Continuously Stirred Tank Reactor) with photocatalytic pellets, and obtained numerical solutions for concentration distribution. The effects of various parameters on reactor performance were investigated, and mathematical modeling of core-shell particles was conducted. The cascade connection of photocatalytic CSTRs and fixed bed reactors was also analyzed. The experimental data were compared with numerical solutions to estimate reaction parameters.
Governing equations were derived for photocatalytic batch reactors and CSTR (Continuously Stirred Tank Reactor) containing photocatalytic pellets to obtain numerical solutions of the concentration in bulk medium and intra-particle concentration based on Langmuir-Hinshelwood kinetics. Numerical solutions could be obtained by finite element method under proper initial and boundary conditions to solve coupled reaction-diffusion equations using partial and ordinary differential equations. Effects of Thiele modulus, Biot number, Langmuir-Hinshel-wood parameter and photocatalyst loading were investigated by predicting the performance of batch reactor. Effects of residence time and initial reactant concentration were studied for CSTR. In addition to conventional morphologies of pellets such as sphere, cylinder and slab, mathematical modeling of core-shell particles was also conducted to study the effect of thickness of inert core. Although the performance of spherical pellets was the best, cylindrical pellets also showed good activity for removing reactant by photocatalytic decomposition. In core-shell spherical pellets, there was little effect of thickness of inert core on the reduction rate of reactant concentration and steady-state concentration in batch and CSTR, respectively, compared to core-shell cylindrical and slab-type particles. The cascade connection of photocatalytic CSTRs and fixed bed reactors with back mixing could be also analysed by finite element method. Experimental data about the removal of methylene blue using silica-titania core-shell particles in batch photocatalytic reactor were compared with numerical solutions to estimate reaction parameters.
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