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Kinetic Study of Adsorption and Transformation of Mercury on Fly Ash Particles in An Entrained Flow Reactor

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Abstract:Experimental studies were performed to investigate the interactions of elemental mercury vapor with entrained fly ash particles from coal combustion in a flow reactor. The rate of transformation of elemental mercury on fly ash particles was evauated over the temperature range from 303K to 780K. The reaction was approximately first order (0.91 for total fly ash, and 0.98 for submicrometer fly ash), and the reaction rate increased with increasing temperature. The results indicate that fly ash particles have sufficient minerals to promote the heterogeneous transformation of mercury. Experiments were then conducted with pure titania, silica, and iron oxide particles. Single component particle experiments (titania, silica and iron oxide) were performed to establish their contributions to the transformation of elemental mercury. Iron oxide caused the conversion of elemental mercury more efficiently than that of fly ash particles, while titania and silica did not result in oxidation or adsorption of the elemental mercury.
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Citation:Zhuang, Y., P. Biswas, M. E. Quintan, T. G. Lee, and E. J. Hedrick. Kinetic Study of Adsorption and Transformation of Mercury on Fly Ash Particles in An Entrained Flow Reactor. Presented at Air & Waste Management Association National Conference, Salt Lake City, UT, June 18-21, 2000.
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Contact: Mary P. O'Bryant - (919)-541-4871 or obriant.mary@epa.gov
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Division: Microbiological & Chemical Exposure Assessment Division
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Branch: Chemical Exposure Research Branch
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Product Type: Sympos/Conf
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Presented: 06/20/2000
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Last Updated on Monday, October 22, 2007
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