Conception et caractérisation de microréacteurs photocatalytiques

Abstract : The overall objective of the research work was to improve the understanding of the photocatalytic reaction of salicylic acid degradation chosen as model pollutant. An open reactor having a parallelepiped channel, of width and depth near millimetre size, coated with TiO catalyst, was used to characterize the salicylic acid degradation in function of channel dimensions, flow rates, inlet pollutant concentrations and UV irradiation intensities. The degraded fraction of salicylic acid decreases with the flow rate, inlet concentration while it increases with UV irradiation intensity. For a given residence time, the reduction of the microchannel depth and width improve the degradation efficiency. Indeed, the reaction rate of degradation generally increases with the ratio of catalyst area on reaction volume. The ratio of coated area on microchannel volume is increased by miniaturization of the channel which leads to a larger degradation. A model based on the Langmuir-Hinshelwood approach which takes into account the mass-transfer account very well for the experimental results. This model highlights that reaction limitation by mass-transfer is larger at the lowest flows (< 10 mL/h) and when the channel becomes deeper. The simulation allows us to predict that conversion ratio of about 90%, can be reach by both acting on the geometry (multichannel reactor, total length of channels of the order of meter) or on the process (batch recirculation reactor)
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Guillaume Charles. Conception et caractérisation de microréacteurs photocatalytiques. Autre. Institut National Polytechnique de Lorraine, 2011. Français. ⟨NNT : 2011INPL012N⟩. ⟨tel-01748878⟩

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