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Received February 29, 2008
Accepted April 23, 2008
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NaClO2를 이용한 NO 산화 특성
Characteristics of NO Oxidation Using NaClO2
Kiman Lee
Youngchul Byun1
Dong Jun Koh†
Dong Nam Shin
Kyoung Tae Kim
Kyoung Bo Ko1
Moohyun Cho1
Won Namkung1
Young Sun Mok2
포항산업과학연구원 환경연구실, 790-600 경상북도 포항시 남구 효자동 산 32번지 1포항공과대학교 환경공학과, 790-784 경상북도 포항시 남구 효자동 산 31번지 2제주대학교 생명화학공학과, 690-756 제주특별자치도 제주시 제주대학교 66
Environment Research Department, Research Institute of Industrial Science & Technology (RIST), San 32 Hyoja-dong, Nam-gu, Pohang 790-600, Korea 1School of Environmental Science and Technology, Pohang University of Science and Technology (POSTECH), San 31 Hyoja-dong, Nam-gu, Pohang 790-600, Korea 2Department of Chemical of Biological Engineering, Jeju National University, 66 Jejudaehakno, Jeju 690-756, Korea
djkoh@rist.re.kr
Korean Chemical Engineering Research, October 2008, 46(5), 988-993(6), NONE Epub 10 November 2008
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Abstract
고정층 반응기에 충진한 NaClO2에 의한 NO 산화특성을 온도와 가스조건 그리고 공간속도 등을 변화시켜가며 알아보았다. NaClO2와 NO의 반응은 온도에 크게 의존함을 알 수 있었다. 110 oC까지 NaClO2와 NO의 반응성은 천천히 증가하고 그 이후의 온도에서는 빠르게 증가하였으며 170 oC 부근에서 가장 높은 반응성을 나타내는 것을 확인하였다. 하지만 190 oC 이상의 온도에서는 NaClO2가 NaCl, NaClO3, 상전이하여 NO와의 반응성이 나타나지 않았다. NaClO2와 NO 반응의 주 생성물은 NO2였으며 가스상 형태의 ClNO, ClNO2 등이 부산물로 나타났다. 이는 NaClO2에 의한 NO의 산화물인 NO2와 NaClO2가 반응하여 가스상 부산물인 OClO를 생성하고, 생성된 OClO가 잔류하는 NO를 NO2로 산화시키며 발생되는 Cl에 의한 것임을 확인하였다. 이와 함께 수분 및 산소의 변화는 NO 산화에 주는 영향이 미미하다는 것을 알 수 있었다.
The characteristics of NO oxidation using sodium chlorite (NaClO2) 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 20~230 oC and 0.4-2.2×105 hr-1, respectively, and the simulation gas mixtures are composed of NO (0~200 ppm), NO2 (0-200 ppm), O2 (0~15%)_x000D_
and H2O (0~15%) within N2 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 oC where the oxidation efficiency of NO is maximized and then abruptly decreased with further increase of reaction temperature, resulting in being negligible over 190 oC._x000D_
Such a behavior in the oxidation efficiency has been originated from the phase transition of NaClO2 at about 170 oC to form NaClO3, and NaCl which are chemically inactive toward the oxidation of NO. The chemical reaction of NO with NaClO2 has been observed to produce NO2, ClNO and ClNO2, whereas that of NO2 only OClO species. Additionally, we have also observed that the introduction of O2 and H2O has little influence on the oxidation of NO.
Keywords
References
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