Get access

Simulations of photodegradation of toluene and formaldehyde in a monolith reactor using computational fluid dynamics

Authors

  • Siewhui Chong,

    1. Dept. of Chemical Engineering, CRC for Contamination Assessment and Remediation of the Environment, Curtin University of Technology, Perth, WA 6845, Australia
    Search for more papers by this author
  • Shaobin Wang,

    1. Dept. of Chemical Engineering, CRC for Contamination Assessment and Remediation of the Environment, Curtin University of Technology, Perth, WA 6845, Australia
    Search for more papers by this author
  • Moses Tadé,

    1. Dept. of Chemical Engineering, CRC for Contamination Assessment and Remediation of the Environment, Curtin University of Technology, Perth, WA 6845, Australia
    Search for more papers by this author
  • H. Ming Ang,

    1. Dept. of Chemical Engineering, CRC for Contamination Assessment and Remediation of the Environment, Curtin University of Technology, Perth, WA 6845, Australia
    Search for more papers by this author
  • Vishnu Pareek

    Corresponding author
    1. Dept. of Chemical Engineering, CRC for Contamination Assessment and Remediation of the Environment, Curtin University of Technology, Perth, WA 6845, Australia
    • Dept. of Chemical Engineering, CRC for Contamination Assessment and Remediation of the Environment, Curtin University of Technology, Perth, WA 6845, Australia
    Search for more papers by this author

Abstract

In this study, simulations were conducted on a monolith reactor for the photodegradation of toluene and formaldehyde. The monoliths in the reactor were treated as porous zones and the photocatalytic oxidation occurring on the monolith surfaces was modeled using Langmuir–Hinshelwood kinetics. A discrete ordinates model was used to simulate the light intensity with a novel approach, which involved an adjustable parameter—the absorption coefficient of the channel wall, for modeling the local light intensity across the porous media. The advantage of this approach was that despite its simplicity, it was able to capture and visualize the local light profile across the monolith channels and to integrate it into the reaction kinetics. Although it required a trial-and-error to determine the correct value of the channel wall absorption coefficient, the proposed model achieved a reasonable agreement between the simulation results and published experimental data. © 2010 American Institute of Chemical Engineers AIChE J, 2011

Ancillary