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Received February 13, 2004
Accepted June 28, 2004
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Reduction Of Nitrogen Oxides by Ozonization-Catalysis Hybrid Process
Department of Chemical Engineering, Cheju National University, Jeju 690-756, Korea 1Department of Chemical Engineering, Pohang University of Science and Technology, Pohang 790-784, Korea
smokie@cheju.ac.kr
Korean Journal of Chemical Engineering, September 2004, 21(5), 976-982(7), 10.1007/BF02705580
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Abstract
Treatment of nitrogen oxides (NOx) by using a hybrid process consisting of ozonization and catalysis was investigated. The ozonization method may be an alternative for the oxidation of NO to NO2. It was found that nitricoxide (NO) was easily oxidzed to nitrogen dioxide (NO2) in the ozonization chamber without using any hydrocarbon additive. In a temperature range of 443 to 503 K, the decomposition of ozone into molecular oxygen was not significant, and one mole of ozone appoximately reacted with one mole of NO. A kinetic study revealed that the oxidation of NO to NO2 by ozone was very fast, almost completed in a few tens of milliseconds. When the amount of ozone added was less than stoichiometric ratio with respect to the initial concentration of NO, negligible NO3 and N2O5 were N2 by a catalyst (V2O5/TiO2), indication that the mixture of NO and NO2 reacts faster than NO.
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