Title
Analytic versus CFD approach for kinetic modeling of gas phase photocatalysis Analytic versus CFD approach for kinetic modeling of gas phase photocatalysis
Author
Faculty/Department
Faculty of Sciences. Bioscience Engineering
Publication type
article
Publication
Lausanne ,
Subject
Chemistry
Biology
Engineering sciences. Technology
Source (journal)
Chemical engineering journal. - Lausanne
Volume/pages
262(2015) , p. 1-8
ISSN
1385-8947
ISI
000347577700001
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
In this work two methods for determining the LangmuirHinshelwood kinetic parameters for a slit-shaped flat bed photocatalytic reactor are compared: an analytic mass transfer based model adapted from literature and a computational fluid dynamics (CFD) approach that was used in conjunction with a simplex optimization routine. Despite the differences between both approaches, similar values for the kinetic parameters and similar trends in terms of their UV intensity dependence were found. Using an effectiveness-NTU (number of transfer units) approach, the analytic mass transfer based method could quantify the relative contributions of the rate limiting steps through a reaction effectiveness parameter. The numeric CFD approach on the other hand could yield the two kinetic parameters that determine the photocatalytic reaction rate simultaneously. Furthermore, it proved to be more accurate as it accounts for the spatial variation of flow rate, reaction rate and concentrations at the surface of the photocatalyst. We elaborate this dual kinetic analysis with regard to the photocatalytic degradation of acetaldehyde in air over a silicon wafer coated with a layer of TiO2 P25 (Evonik) and study the usefulness and limitations of both strategies.
E-info
https://repository.uantwerpen.be/docman/iruaauth/fa6483/427c1561dca.pdf
Full text (open access)
https://repository.uantwerpen.be/docman/irua/218a67/8828.pdf
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