Optimal catalyst thickness in titanium dioxide fixed film reactors: Mathematical modelling and experimental validation

Vezzoli, Massimiliano, Farrell, Troy, Baker, Adrian, Psaltis, Steven, Martens, Wayde N., & Bell, John M. (2013) Optimal catalyst thickness in titanium dioxide fixed film reactors: Mathematical modelling and experimental validation. Chemical Engineering Journal, 234, pp. 57-65.

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Abstract

The use of immobilised TiO2 for the purification of polluted water streams introduces the necessity to evaluate the effect of mechanisms such as the transport of pollutants from the bulk of the liquid to the catalyst surface and the transport phenomena inside the porous film. Experimental results of the effects of film thickness on the observed reaction rate for both liquid-side and support-side illumination are here compared with the predictions of a one-dimensional mathematical model of the porous photocatalytic slab. Good agreement was observed between the experimentally obtained photodegradation of phenol and its by-products, and the corresponding model predictions. The results have confirmed that an optimal catalyst thickness exists and, for the films employed here, is 5 μm. Furthermore, the modelling results have highlighted the fact that porosity, together with the intrinsic reaction kinetics are the parameters controlling the photocatalytic activity of the film. The former by influencing transport phenomena and light absorption characteristics, the latter by naturally dictating the rate of reaction.

Impact and interest:

5 citations in Scopus
4 citations in Web of Science®
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ID Code: 63419
Item Type: Journal Article
Refereed: Yes
Keywords: Photocatalysis, Titanium dioxide, Intrinsic kinetics, Optimal thickness, Mass transport, Porosity, Porous flow, Mathematical modeling
DOI: 10.1016/j.cej.2013.08.049
ISSN: 1385-8947
Subjects: Australian and New Zealand Standard Research Classification > MATHEMATICAL SCIENCES (010000) > APPLIED MATHEMATICS (010200) > Applied Mathematics not elsewhere classified (010299)
Australian and New Zealand Standard Research Classification > PHYSICAL SCIENCES (020000) > OTHER PHYSICAL SCIENCES (029900) > Complex Physical Systems (029902)
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > Schools > School of Mathematical Sciences
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Funding:
Deposited On: 17 Oct 2013 04:25
Last Modified: 24 Aug 2016 00:10

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