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Mass transfer measurements and modeling in a microchannel photocatalytic reactor

Abstract : The main objective of this paper was to evaluate the influence of mass transfer on the photocatalytic efficiency at a low flow rate in the order of several mL per hour. Several continuous flow microchannel reactors have been used to study the degradation of salicylic acid (SA) taken as a model pollutant. The photocatalytic degradation of salicylic acid, under UV illumination of 1.5 mW cm−2, was assessed from the outlet concentration measured by liquid chromatography HPLC. It was shown that the degradation of SA by UV was limited by mass transfer. Numerical simulations have allowed establishing a relationship of the Sherwood number valuable for all the microchannel geometries. Computational fluid dynamics with Comsol Multiphysics is useful for predicting the degradation yield for a given geometry of the microreactor. The best representation of the experimental data is obtained by introducing a kinetic law taking into account mass transfer limitation.
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https://hal.archives-ouvertes.fr/hal-00977556
Contributor : Serge Corbel <>
Submitted on : Friday, April 11, 2014 - 11:53:06 AM
Last modification on : Thursday, January 11, 2018 - 6:27:14 AM

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Serge Corbel, Nidhal Becheikh, Thibault Roques-Carmes, Orfan Zahraa. Mass transfer measurements and modeling in a microchannel photocatalytic reactor. Chemical Engineering Research and Design, Elsevier, 2014, 92, pp.657-662. ⟨10.1016/j.cherd.2013.10.011⟩. ⟨hal-00977556⟩

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