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Effect of Ozone Injection into Exhaust Gas on Catalytic Reduction of Nitrogen Oxides  

Yun, Eun-Young (Department of Chemical Engineering & Clean Technology, Cheju National University)
Mok, Young-Sun (Department of Chemical Engineering & Clean Technology, Cheju National University)
Shin, Dong-Nam (Environment Research Team, Research Institute of Industrial Science and Technology)
Koh, Dong-Jun (Environment Research Team, Research Institute of Industrial Science and Technology)
Kim, Kyong-Tae (Environment Research Team, Research Institute of Industrial Science and Technology)
Publication Information
Journal of Korean Society of Environmental Engineers / v.27, no.3, 2005 , pp. 330-336 More about this Journal
Abstract
The ozone injection method was proposed to improve the catalytic process for the removal of nitrogen oxides ($NO_x$). Nitric oxide (NO) in the exhaust gas was first oxidized to nitrogen dioxide ($NO_2$) by ozone produced by dielectric barrier discharge, and then the exhaust gas containing the mixture of NO and $NO_2$ was directed to the catalytic reactor where both NO and $NO_2$ were reduced to $N_2$ in the presence of ammonia as the reducing agent. A commercially available $V_2O_5-WO_3/TiO_2$ catalyst was used as the catalytic reactor. The $NO_2$ content in the mixture of NO and $NO_2$ was changed by the amount of ozone added the exhaust gas. The effect of reaction temperature, initial $NO_x$ concentration, feed gas flow rate, and ammonia concentration on the removal of $NO_x$ at various $NO_2$ contents was examined and discussed. The increase in the content of $NO_2$ by the ozone injection remarkably improved the performance of the catalytic reactor, especially at low temperatures. The present ozone injection method appears to be promising for the improvement of the catalytic reduction of $NO_x$.
Keywords
Catalytic Reduction; Nitrogen Oxides; Ozone Injection;
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