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Characteristics of NO Oxidation Using NaClO2  

Lee, Kiman (Environment Research Department, Research Institute of Industrial Science & Technology (RIST))
Byun, Youngchul (School of Environmental Science and Technology, Pohang University of Science and Technology (POSTECH))
Koh, Dong Jun (Environment Research Department, Research Institute of Industrial Science & Technology (RIST))
Shin, Dong Nam (Environment Research Department, Research Institute of Industrial Science & Technology (RIST))
Kim, Kyoung Tae (Environment Research Department, Research Institute of Industrial Science & Technology (RIST))
Ko, Kyoung Bo (School of Environmental Science and Technology, Pohang University of Science and Technology (POSTECH))
Cho, Moohyun (School of Environmental Science and Technology, Pohang University of Science and Technology (POSTECH))
Namkung, Won (School of Environmental Science and Technology, Pohang University of Science and Technology (POSTECH))
Mok, Young Sun (Department of Chemical of Biological Engineering, Jeju National University)
Publication Information
Korean Chemical Engineering Research / v.46, no.5, 2008 , pp. 988-993 More about this Journal
Abstract
The characteristics of NO oxidation using sodium chlorite ($NaClO_2$) powder have been investigated by a flow type packed-bed reactor, where the reaction temperature and the space velocity are varied in the range of $20{\sim}230^{\circ}C$ and $0.4-2.2{\times}10^5hr^{-1}$, respectively, and the simulation gas mixtures are composed of NO (0~200 ppm), $NO_2$ (0-200 ppm), $O_2$ (0~15%) and $H_2O$ (0~15%) within $N_2$ balance. It has been found that the oxidation efficiency of NO depends greatly on the reaction temperature, exhibiting the existence of critical reaction temperature at about $170^{\circ}C$ where the oxidation efficiency of NO is maximized and then abruptly decreased with further increase of reaction temperature, resulting in being negligible over $190^{\circ}C$. Such a behavior in the oxidation efficiency has been originated from the phase transition of $NaClO_2$ at about $170^{\circ}C$ to form $NaClO_3$, and NaCl which are chemically inactive toward the oxidation of NO. The chemical reaction of NO with $NaClO_2$ has been observed to produce $NO_2$, ClNO and $ClNO_2$, whereas that of $NO_2$ only OClO species. Additionally, we have also observed that the introduction of $O_2$ and $H_2O$ has little influence on the oxidation of NO.
Keywords
NO Oxidation; $NO_2$; Sodium Chlorite; $NaClO_2$; OClO; ClNO; $ClNO_2$;
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