화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Applied Chemistry for Engineering, Vol.31, No.5, 560-567, October, 2020
DOI10.14478/ace.2020.1069  Export Citation
알칼리 금속 이온(Na, K)이 V/W/TiO2의 NH3-SCR 반응인자에 미치는 영향
The Effect of Alkali Metal Ions (Na, K) on NH3-SCR Response of V/W/TiO2
여종현, 홍성창1, †
  • 경기대학교 일반대학원 환경에너지공학과
  • 1경기대학교 환경에너지공학과
Jonghyeon Yeo, and Sungchang Hong1, †
  • Department of Environmental Energy Engineering, Graduate school of Kyonggi University, Suwon 16227, Korea
  • 1Department of Environmental Energy Engineering, Kyonggi University, Suwon 16227, Korea
E-mail:
초록
본 연구는 다양한 산업공정의 배가스 중 대표적인 활성저하 물질로 알려진 알칼리 금속[Na(Sodium)과 K(Potassium)]이 V/W/TiO2 촉매의 NH3-SCR 반응에 미치는 영향을 확인 하였다. 이에 따른 활성 저하 원인을 규명하고자 NO, NH3-TPD, DRIFT, H2-TPR 분석을 수행 하였다. 그 결과, 각 알칼리 금속은 촉매 피독으로 작용하여 NH3 흡착양이 저하되고, Na과 K은 촉매의 반응 활성에 기여하는 L산점과 B산점을 감소시켜 SCR 반응을 저하시킨다. H2-TPR 분석을 통하여 알칼리 금속은 V-O-V (bridge oxygen bond)와 V=O (terminal bond)의 환원 온도에 영향을 끼쳐, 환원 온도가 고온으로 올라가기 때문에 활성 저하 원인으로 판단된다.
In this study, we investigated that the effect of alkali metals [Na(Sodium) and K(Potassium)], known as representative deactivating substances among exhaust gases of various industrial processes, on the NH3-SCR (selective catalytic reduction) reaction of V/W/TiO2 catalysts. NO, NH3-TPD (temperature programmed desorption), DRIFT (diffuse reflectance infrared fourier transform spectroscopy analysis), and H2-TPR analysis were performed to determine the cause of the decrease in activity. As a result, each alkali metal acts as a catalyst poisoning, reducing the amount of NH3 adsorption, and Na and K reduce the SCR reaction by reducing the L and B acid points that contribute to the reaction activity of the catalyst. Through the H2-TPR analysis, the alkali metal is considered to be the cause of the decrease in activity because the reduction temperature rises to a high temperature by affecting the reduction temperature of V-O-V (bridge oxygen bond) and V=O (terminal bond).
Keywords:NH3-SCR;Catalyst;Alkali;Vanadium;Poisoning
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