Photocatalysis for waste gas treatment: kinetics and fluidized bed reactor modeling
Date
2008
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
The focus of this study is on photocatalysis as a technique for waste gas treatment. In order to have a better understanding of the mechanism of photocatalysis and to solve the deficiencies of previously suggested kinetic models, a model is developed which considers the important role of charge trapping. The proposed kinetic model has a realistic description of the reaction pathways for degradation of trichloroethylene (TCE), an environmentally relevant volatile organic compound (VOC). Moreover, the performance of various kinetic and hydrodynamic models is examined for TCE photocatalysis in fluidized bed reactors (FBR). For the hydrodynamic sub-model, the generalized bubbling/turbulent (GBT) and sequential modular approach are used. The reaction sub-model is performed with some simple kinetic models like 1st order, Langmuir-Hinshelwood, Langmuir-Hinshelwood with UV consideration as well as the more complex ones like Demeestere kinetic model. A modification method, as a tune factor, is proposed to adjust the kinetic parameters for the photocatalytic reactions in an FBR where a larger fraction of the catalyst is illuminated in comparison with fixed bed operation. The results indicate that both hydrodynamic models can give fair agreement with the experimental data when coupled with modified Demeestere kinetic model. Although both hydrodynamic models fail to predict the measured data when combined with simpler kinetic models, GBT can return more reasonable values than the modular approach. Furthermore, GBT together with modified Demeestere kinetic model provides good predictions in a circulating FBR which operates at higher range of gas velocities.
Description
Bibliography: p. 83-89
Some pages are in colour.
Some pages are in colour.
Keywords
Citation
Karimi Golpayegani, M. (2008). Photocatalysis for waste gas treatment: kinetics and fluidized bed reactor modeling (Master's thesis, University of Calgary, Calgary, Canada). Retrieved from https://prism.ucalgary.ca. doi:10.11575/PRISM/1912