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Simultaneous Removal of $SO_2$ and NOx Using Ozone Generator and Absorption- Reduction Technique  

Mok, Young-Sun (Department of Chemical Engineering & Clean Technology, Cheju National University)
Lee, Joo-Hyuck (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.28, no.2, 2006 , pp. 191-196 More about this Journal
Abstract
The injection of ozone, produced by dielectric barrier discharge, into the exhaust gas gives rise to a rapid oxidation of NO that is the main component of nitrogen oxides($NO_x$) in most practical exhaust gases. Once NO is converted into $NO_2$, it on readily be reduced to $N_2$ in the next step by a reducing agent such as sodium sulfide and sodium sulfite. The reducing agents used ca also remove $SO_2$ effectively, which makes it possible to treat $NO_x\;and\;SO_2$ simultaneously. The present two-step process made up of an ozonizing chamber and an absorber containing a reducing agent solution was able to remove about 95% of the $NO_x$ and 100% of the $SO_2$, initially contained in the simulated exhaust gas. The formation of $H_2S$ from sodium sulfide was prevented by using a strong basic reagent(NaOH) together with the reducing agent. The removal of $NO_x$\;and\;SO_2$ was more effective for $Na_2S$ than $Na_2SO_3$.
Keywords
Ozone; Absorption-Reduction; Nitrogen Oxides; Sulfur Dioxide;
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