Modeling and simulation of VOCs removal by nonthermal plasma discharge with photocatalysis in a continuous reactor: Synergetic effect and mass transfer

Aymen Amine Assadi (1, 2) , Abdelkrim Bouzaza (2, 1) , Smail Merabet (3) , Dominique Wolbert (2, 1)

1 UEB - Université européenne de Bretagne - European University of Brittany
2 ISCR - Institut des Sciences Chimiques de Rennes
3 Laboratoire d’Hydraulique Appliquée et Environnement

This paper deals with photocatalysis (TiO2 + UV), nonthermal plasma (NTP) and their combinations. These processes have been widely studied for isovaleraldehyde (Isoval) treatment. Isoval removal, selectivity of CO2 and CO, and ozone formation are investigated in order to evaluate the performance of the combined process. The results show that the performance of the process has enhanced and a synergetic effect is observed. On the other hand, this work aims at investigating kinetic modeling of combined process with taking into account the mass transfer step. The model is based on mass balances in three types of region: bulk region, discharge zone and solid phase which contains the photocatalyst. The oxidation in discharge and solid phases is described in two stages. Firstly, the removal of Isoval gives an equivalent intermediate (EI). Secondly, EI is oxidized into carbon dioxide (CO2) and carbon monoxide (CO). This simplified approach of removal allows for an agreement between modeling and empirical data in terms of degradation and mineralization. It also allows for the simulation of NTP and photocatalytic kinetics without knowing the plausible pathway. Moreover, the synergetic effect can be represented correctly by increasing mass transfer constant.

Mots clés: Kinetic modeling; Synergetic effect

Mots clés: Continuous reactor; Photocatalysis

Mots clés: Plasma

Mots clés: Mass transfer

Domaines: Chimie inorganique

Aymen Amine Assadi, Abdelkrim Bouzaza, Smail Merabet, Dominique Wolbert. Modeling and simulation of VOCs removal by nonthermal plasma discharge with photocatalysis in a continuous reactor: Synergetic effect and mass transfer. The Chemical Engineering Journal, 2014, 258, pp.119-127. ⟨10.1016/j.cej.2014.07.050⟩. ⟨hal-01064033⟩