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Modélisation et simulation numérique de la dégradation photocatalytique d'un polluant modèle dans un microréacteur

Abstract : Industrial photocatalysis applications requires further research to control and design photocatalytic reactors. The micro structuring of reactors is an innovative solution. It increases the catalytic efficiency by improving the contact of the pollutant with the catalyst. Thesis aim concerned the destruction of a model pollutant, salicylic acid, with deposited catalyst (TiO2) at the bottom of a microchannel. The research is based on experiments and simulations to predict the photocatalytic degradation for a given reactor configuration. In our experimental conditions of low flow, an axial dispersion and a concentration gradient between the catalyst surface and the reaction medium have been demonstrated. We have shown that the gradient of velocity is more pronounced in low cross section microreactors. This gradient allows the formation of recirculation zones near the catalytic surface thus creating favorable conditions for contact between the pollutant and the catalytic surface. Using numerical soft, we have simulated the reaction of photocatalytic degradation to represent our experimental results. On a one hand, the role of diffusion to the catalytic surface has been demonstrated. On the other hand, numerical simulation has allowed to establish a relationship between the Sherwood number as a function of Reynolds number, Schmidt and the hydraulic diameter of the microchannel. This relationship is used to estimate the mass transfer constant to represent correctly the photocatalytic degradation
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Nidhal Becheikh. Modélisation et simulation numérique de la dégradation photocatalytique d'un polluant modèle dans un microréacteur. Alimentation et Nutrition. Université de Lorraine, 2012. Français. ⟨NNT : 2012LORR0333⟩. ⟨tel-01749478⟩

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