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Received April 11, 2019
Accepted June 12, 2019
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This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
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NH3-induced removal of NOx from a flue gas stream by silent discharge ozone generation in a double reactor system
Yujin Hwang
Abid Farooq
Sung Hoon Park1
Ki Hoon Kim
Myong-Hwa Lee2
Seuk Cheun Choi3
Min Young Kim1
Rae-su Park4
Young-Kwon Park†
School of Environmental Engineering, University of Seoul, Seoul 02504, Korea 1Department of Environmental Engineering, Sunchon National University, Suncheon 57922, Korea 2Department of Environmental Engineering, Kangwon National University, Chuncheon 24341, Korea 3Thermochemical Energy System R&D Group, Korea Institute of Industrial Technology, Cheonan 31056, Korea 4Department of Bioenvironmental & Chemical Engineering, Chosun College of Science & Technology, Gwangju 501-744, Korea
catalica@uos.ac.kr
Korean Journal of Chemical Engineering, August 2019, 36(8), 1291-1297(7), 10.1007/s11814-019-0325-8
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Abstract
NOx, a generic term for the nitrogen oxides generated from combustion in the presence of nitrogen, is a serious threat to human health. This study examined the removal of NOx using ammonia (NH3) and ozone produced using a silent discharge method. The effects of temperature and residence time on NOx removal with NH3 injection in a double reactor system were investigated. An increase in temperature resulted in higher levels of O3 decomposition, whereas the maximum particle formation in the form of ammonium nitrate (NH4NO3) was achieved when both reactors were kept at 180 °C. NH3 and O3 injection in large quantities and NO in smaller amounts with a residence time of 10.2 s resulted in the maximum particulate formation. In contrast, when an excess of NH3 was supplied, it resulted in N2O formation due to the formation of NH2 radicals generated from a reaction of NO2 with NH3. In addition, 100% NO removal was achieved regardless of the residence time. Kinetic simulations indicated the possibility of moisture being the limiting reactant.
Keywords
References
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Kitayama J, Kuzumoto M, J. Phys. D-Appl. Phys., 30, 2453 (1997)
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Feick G, Hainer RM, J. Am. Chem. Soc., 76, 5860 (1954)
