A mass transfer based method for measuring the reaction coefficients of a photocatalyst |
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| Affiliation: | 1. Taibah University, College of Science, Chemistry Department, AlMadinah AlMounawara, Saudi Arabia;2. Egyptian Petroleum Research Institute, Nasr City, Cairo, Egypt;3. Chemistry Department, Faculty of Science, Ain Shams University, Abbassia, Cairo 11566, Egypt;1. School of Environmental Science and Engineering, Shanghai Jiao Tong University, No. 800 Dong Chuan Road, Shanghai 200240, PR China;2. School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, PR China;3. Chemistry Department of Sciences, John Jay College of Criminal Justice, The City University of New York, New York, NY 10019, United States;1. LSRE – Laboratory of Separation and Reaction Engineering, Associate Laboratory LSRE/LCM, Faculdade de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal;2. LCM – Laboratory of Catalysis and Materials, Associate Laboratory LSRE/LCM, Faculdade de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal;1. FOTOAir-Ciemat, Unit of Analysis and Photocatalytic Treatment of Pollutants in Air, Avda. Complutense 40, 28040, Madrid, Spain;2. Institute for Catalysis, Hokkaido University, Sapporo, 001-0021, Japan |
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| Abstract: | We have developed a new method, the mass transfer based (MTB) method, for measuring the Langmuir–Hinshelwood (L–H) rate form reaction coefficients of photocatalysts. The conventional method for determining the reaction coefficients disregards the effect of mass transfer on the reaction surface by designing and controlling a reaction process to be reaction-limited. In contrast, the new MTB method takes the mass transfer effect into account by using a computational fluid dynamics (CFD) method. The reaction coefficients can be regressed by the measured reaction rates and the calculated VOC concentrations in the air adjacent to the reaction surface. Thus, by using the new method, the reaction coefficient of a reaction process can be accurately determined even if it is not reaction-limited. This is very important in cases where it is difficult to realize reaction-limited processes, such as photocatalytic oxidation of VOCs with strong UV radiation intensity. The relative error of the regressed reaction coefficients obtained by the new method is analyzed. To illustrate, we apply this method to measuring the reaction coefficients of TiO2 photocatalytic decomposing formaldehyde. This method is very useful in determining the reaction coefficients of the photocatalytic oxidation of various VOCs simultaneously. |
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