Étude cinétique de la dégradation photocatalytique de composés organiques volatils (COV) et modélisation par une approche numérique de la mécanique des fluides

Abstract : VOCs are a source of discomfort for occupants and can have harmful effects on health. Photocatalysis is a promising process to remove these compounds. ArcelorMittal Liège Research has indeed developed TiOB2 Bthin film coated on steel which can be easily integrated into purification air systems. Objectives of this research are firstly, identifying parameters which influence the photocatalytic degradation of these VOCs using of such catalyst. Secondly, validate the possibility to predict performances of the photocatalytic reactor by combining fluid flow and photocatalytic reaction. An experimental set-up including an annular reactor has been designed and realized in order to conduct kinetic studies. Acetaldehyde has been chosen as a pollutant model and studied mainly with concentrations of few ppm ranges. Its conversion yield depends on pollutant concentration, relative humidity, temperature, UV light intensity and presence of others VOCs. Based on a theoretical surface model of the photocatalytic reaction, and using experimental data, this reaction is modelled. In order to predict performances of the photocatalytic reactor packed thin film of TiOB2B, a methodology which consists to combine fluid flow and photocatalytic reaction has been developed and validated. Space-time distribution of pollutant concentration is then determined with a computational fluid dynamics approach. Comparison between experimental data and numerical simulations obtained with a photocatalytic reactor at the laboratory scale and another one in semi-pilot scale are well satisfactory
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Amélie Queffeulou. Étude cinétique de la dégradation photocatalytique de composés organiques volatils (COV) et modélisation par une approche numérique de la mécanique des fluides. Autre. Institut National Polytechnique de Lorraine, 2009. Français. ⟨NNT : 2009INPL068N⟩. ⟨tel-01748735⟩

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