Simulation of Volatile Organic Compounds (VOCs) Photocatalytic Removal in a Fluidized Bed Reactor

Document Type : Research Article

Authors

1 School of Chemical Engineering, College of Engineering, University of Tehran, Tehran, I.R. IRAN

2 Department of Occupational Health, Health Faculty, Urmia University of Medical Sciences, Urmia, I.R. IRAN

3 Department of Occupational Health, School of Public Health, Tehran University of Medical Sciences, Tehran, I.R. IRAN

Abstract

Photocatalytic oxidation within reactors, as a promising method from economical and environmentally friendly points of view, is used to VOC treatment; and among various types of reactor, the fluidized bed reactor as an efficient reactor is employed for this aim. Modeling and simulation of photocatalytic fluidized bed reactors are essential for scale-up, optimization, and control. In this study, Methyl Ethyl Ketone (MEK), TriColor Ethylene (TCE), and toluene were considered as pollutant models, and photocatalytic conversion of these chemicals in the fluidized bed reactor was simulated. In order to simulate the performance of the photocatalytic fluidized bed reactor, the kinetic sub-model and the hydrodynamic sub-model were coupled together and solved simultaneously.  The Langmuir-Hinshelwood (LH) kinetic model was adopted for photocatalytic conversion of pollutants and its kinetic parameters were determined experimentally. The dynamic two-phase models were considered as the hydrodynamic sub-model and its validity was investigated through comparing the simulation data and the experimental results. It was observed that there is close agreement between the model and the experimental data. The modeling and simulation results of this study can be used to predict the performance of the photocatalytic fluidized bed reactor.

Keywords

Main Subjects

References

[1] Alberici R.M., Jardim W.F., Photocatalytic Destruction of VOCs in the Gas-Phase Using Titanium Dioxide, Applied Catalysis B: Environmental, 14, p. 55 (1997).
[2] Avila P., Bahamonde A., Blanco J., Sanchez B., Cardona A., Romero M., Gas-Phase Photo-Assisted Mineralization of Volatile Organic Compounds by Monolithic Titania Catalysts, Applied Catalysis B: Environmental, 17, p. 75 (1998).
[3] Beauchet R., Magnoux P., Mijoin J., Catalytic Oxidation of Volatile Organic Compounds (VOCs) Mixture (Isopropanol/o-xylene) on Zeolite Catalysts, Catalysis Today, 124, p. 118 (2007).
[4] Sano T., Negishi N., Takeuchi K., Matsuzawa S., Degradation of Toluene and Acetaldehyde with Pt-Loaded TiO2 Catalyst and Parabolic Trough Concentratorr, Solar Energy, 77, p. 543 (2004).
[5] Kim K.J., Kang C.S., You Y.J., Chung M.C., Woo M.W., Jeong W.J. et al., Adsorption-Desorption Characteristics of VOCs Over Impregnated Activated Carbons, Catalysis today, 111, p. 223 (2006).
[6] Samantaray S.K., Parida K., Modified TiO2/SiO2 Mixed Oxides: Effect of Manganese Concentration and Activation Temperature Towards Catalytic Combustion of Volatile Oorganic Compounds, Applied Catalysis B: Environmental, 57, p. 83 (2005).
[7] Bouzaza A., Laplanche A., Photocatalytic Degradation of Toluene in the Gas Phase: Comparative Study of Some TiO2 Supports, Journal of Photochemistry and Photobiology A: Chemistry, 150, p. 207 (2002).
[8] Sano T., Negishi N., Kutsuna S., Takeuchi K., Photocatalytic Mineralization of Vinyl Chloride on TiO2, Journal of Molecular Catalysis A: Chemical, 40, p. 168 (2001).
[9] Motamed Dashliborun A., “Experimental Study and Modeling of Photocatalytic Oxidation of Volatile Organic Compound(VOC) by Titanium Dioxide Nanoparticles in a Fluidized Bed Reactor,” M.Sc. Thesis, University of Tehran, Iran (2012).
[10] Jafari R., Sotudeh‐Gharebagh R., Mostoufi N., Modular Simulation of Fluidized Bed Reactors Chemical Engineering & Technology, 27, p. 123 (2004).
[11] Karimi Golpayegani M., "Photocatalysis for Waste Gas Treatment: Kinetics and Fluidized Bed Reactor Modeling," M.Sc. Thesis, University of Calgary, Canada (2008).
[12] Jafari R., Sotudeh-Gharebagh R., Mostoufi N., Two-Phase Simulation of Gas-Solid Fluidized Bed Reactors by Tanks-in-Series Model, Nashrieh Shimi va Mohandesi Shimi Iran, 23(2), p. 33 (2004). [in Persian].
[13] Mostoufi N., Cui H., Chaouki J., A Comparison of Two-and Single-Phase Models for Ffluidized-Bed Reactors, Industrial & Engineering Chemistry Research, 40, p. 5526 (2001).
[14] Cui H., Mostoufi N., Chaouki J., Characterization of Dynamic Gas-Solid Distribution in Fluidized Beds, Chemical Engineering Journal, 79, p. 133 (2000).
[15] Wen C., Yu Y., A Generalized Method for Predicting the Minimum Fluidization Velocity, AIChE Journal, 12, p. 610 (1966).
[16] Cai P., Schiavetti M., De Michele G., Grazzini G., Miccio M., Quantitative estimation of bubble size in PFBC, Powder technology, 80, p. 99 (1994).
[17] Kunii D., Levenspiel O., “Fluidization Engineering”: Butterworth-Heinemann Boston; (1991).
[18] Fogler H. S., “Elements of Chemical Reaction Engineering”, London: Prentice-Hall International; (1999).
[19] Peral J., Domnech X., Ollis  F., Heterogeneous Photocatalysis for Purification, Decontamination and Deodorization of Air, Wiley Online Library, p. 117 (1997).
[20] Lim T.H., Kim S.D., Trichloroethylene Degradation by Photocatalysis in Annular Flow and Annulus Fluidized Bed Photoreactors, Chemosphere, 54, p. 305 (2004).
[21] Tomašić V.,  Jović F.,  Gomzi Z., Photocatalytic Oxidation of Toluene in the Gas Phase: Modelling an Annular Photocatalytic Reactor., Catalysis Today, 137, p. 350 (2008).
[22] Hajaghazadeh M., Kakooei H., Motamed Dashliborun A., Sotudeh-Gharebagh R., Golbabaie F., Afshar S. et al., Photocatalytic Degradation of Methyl Ethyl Kketone by Nano TiO2 in a Fluidized Bed Reactor, Fresenius Environmental Bulletin, 22 (2012).
[23] Zhang X., Liao C., Photocatalytic Degradation of Toluene by Nano-TIO2 in a Fluidized Bed, Bepress, p. 73 (2007).
[24] Prieto O., Fermoso J., Irusta R., Photocatalytic Degradation of Toluene in Air Using a Fluidized Bed Photoreactor, International Journal of Photoenergy, 2007, p. 1 (2007).
[25] Lim T.H., Kim S.D., Photo-Degradation Characteristics of TCE (Trichloroethylene) in an Annulus Fluidized Bed Photoreactor, Korean Journal of Chemical Engineering, 21, p. 905 (2004).
[26] Kuo H., Wu C., Hsu R., Continuous Reduction of Toluene Vapours from the Contaminated Gas Stream in a Fluidised Bed Photoreactor, Powder Technology, 195, p. 50 (2009). 

Files

Share

How to cite

Statistics