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Language: korean

Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received January 2, 2008
Accepted January 9, 2008

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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망간황화물을 이용한 NO의 선택적 촉매 환원

Selective Catalytic Reduction of NO on Manganese Sulfates

정순관^† 박태성¹ 홍성창²

Soon Kwan Jeong^† Tae Sung Park¹ Sung Chang Hong²

한국에너지기술연구원 청정석탄 연구센터, 305-343 대전시 유성구 장동 71-2 ¹이산화탄소저감 및 처리기술개발사업단, 305-343 대전시 유성구 장동 71-2 ²경기대학교 환경공학과, 443-760 경기도 수원시 영통구 이의동 산 94-6

Clean Coal Research Center, Korea Institute of Energy Research, 71-2 Jang-dong, Yusung-ku, Daejeon 305-343, Korea ¹Carbon Dioxide Reduction and Sequestration R&D Center, 71-2 Jang-dong, Yusung-ku, Daejeon 305-343, Korea ²Department of Environmental Engineering, Kyonggi University, 94-6 Yiui-dong, Yeongtong-ku, Suwon 443-760, Korea

jeongsk@kier.re.kr

Korean Chemical Engineering Research, June 2008, 46(3), 473-478(6), NONE Epub 7 July 2008

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Abstract

망간황화물이 NO의 선택적 촉매 환원에 미치는 영향을 반응성 및 속도론적평가와 TPR(Temperature Programmed Reduction), TGA분석을 통하여 고찰하였다. 망간산화물은 200 ℃ 이하의 저온에서 우수한 질소산화물 전환을 보였으나, 망간황화물의 경우 황화정도에 따라 질소산화물 전환은 고온으로 전이하였다. 또한 질소산화물 전환율도 황화정도에 따라 감소하였다. TPR 실험결과 망간산화물들은 160 ℃ 이하의 낮은 온도에서 환원이 시작되었으나 망간황화물은 280 ℃ 이상의 온도에서 환원이 시작되었다. TPR 실험을 통한 환원 시작온도는 촉매의SCR 시작 온도와 관련이 있는것으로 판단된다. 망간황화물의 활성화에너지는 다른 촉매에 비해 낮게 나타났으나 pre-exponential 상수 크기가 다른 촉매에 비해 1/1000배 만큼 작아 NO에 대한 활성이 낮게 나타났다. 천연망간광석은 함유된 다양한 금속산화물의 영향으로 순수한 망간산화물보다 낮은 온도에서 재생되었다.

In this experimental, selective catalytic reduction (SCR) of NO with NH3 over manganese sulfates and manganese sulfates was investigated with catalytic activity, kinetics, temperature programmed reduction (TPR) and TGA. Manganese oxides showed high catalytic activity for SCR at temperature below 200 ℃. In case of manganese sulfates, the temperature at which SCR of nitric oxide appears shifted to high temperature with sulfation degree, and the maximum catalytic efficiency decreased. The temperature of the onset of reduction for manganese oxides and manganese sulfates is about 160 ℃ and over 280 ℃, respectively. We suggest that the onset of reduction in TPR correlates with the onset of SCR activity. Because the pre-exponential factor of manganese sulfates is lower as 1/1000 times than that of other catalysts, catalytic activity of manganese sulfates for NO showed low. The reduction temperature of natural manganese ore which consists of various metal oxides showed lower than that of pure manganese oxides.

Keywords

Manganese Oxide Manganese Sulfate Selective Catalytic Reduction TPR

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