How chemical and physical mechanisms enable the influence of the operating conditions in a photocatalytic indoor air treatment device to be modeled

Frédéric Batault (1, 2, 3, 4) , Valérie Hequet (3, 4) , Cécile Raillard (3) , Frédéric Thévenet (1, 2) , Nadine Locoge (2, 1) , Laurence Le Coq (5, 6)

1 Université de Lille
2 Mines Douai EMD - École des Mines de Douai
3 GEPEA-TEAM - Traitement Eau Air Métrologie
4 IMT Atlantique - DSEE - Département Systèmes Energétiques et Environnement
5 IMT Atlantique - IMT Atlantique
6 GEPEA-VERTE - Valorisation Energie-matière des Résidus et Traitement des Emissions

The photocatalytic degradation of toluene in indoor air conditions was performed in a closed-loop multi-pass photocatalytic reactor using the Box-Behnken experimental design methodology. The objective of this work was to rigorously determine a kinetic model in order to understand the behavior of the reactor in real indoor air conditions and to relate the kinetic parameters to physical and chemical mechanisms. Three main parameters were studied: initial toluene concentration, light irradiance and air stream velocity. The experimental results were used to calculate the single-pass removal efficiency for different operating conditions and to establish a relationship between the single-pass removal efficiency, light irradiance and air stream velocity. This relationship was integrated into an overall reaction rate law based on the Langmuir-Hinshelwood mechanism. The kinetic model obtained was then validated for various experimental conditions.

Mots clés: Indoor air; Reaction rate law; Photocatalysis; Experimental design

Domaines: Génie des procédés; Chimie organique

Frédéric Batault, Valérie Hequet, Cécile Raillard, Frédéric Thévenet, Nadine Locoge, et al.. How chemical and physical mechanisms enable the influence of the operating conditions in a photocatalytic indoor air treatment device to be modeled. Chemical Engineering Journal, 2017, 307, pp.766 - 775. ⟨10.1016/j.cej.2016.08.118⟩. ⟨hal-01423685⟩