화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Applied Chemistry for Engineering, Vol.26, No.2, 193-198, April, 2015
Export Citation
다양한 상용 TiO2 담체의 물리화학적 특성과 Ce/Ti 촉매의 SCR 반응활성과의 상관성 연구
Correlation between Physicochemical Properties of Various Commercial TiO2 Supports and NH3-SCR Activities of Ce/Ti Catalysts
권동욱, 홍성창†
  • 경기대학교 일반대학원 환경에너지공학과
Dong Wook Kwon, and Sung Chang Hong†
  • Department of Environmental Energy Engineering, Graduate School of Kyonggi University, 94 San, Iui-dong, Youngtong-ku, Suwon-si, Gyeonggi-do 442-760, Republic of Korea
E-mail:
초록
다양한 상용 TiO2 담체를 이용한 Ce/Ti 촉매를 습윤함침법으로 제조하여 TiO2의 물리화학적 특성 및 선택적촉매환원(SCR) 반응활성과의 상관관계에 관하여 연구하였다. TiO2의 특성은 XRD, BET, XPS 및 pH와 같은 물리화학적 분석을 통해 수행되었다. Ce/Ti 촉매는 TiO2의 물리화학적 특성에 따라 각기 다른 SCR 활성을 나타내었다. TiO2의 비표면적이 증가됨에 따라 우수한 활성을 나타내었다. CeOx surface density의 경우 2.5∼14.5 CeOx/nm2의 범위에서 우수한 활성을 보였으며, 14.5 CeOx/nm2 이상에서는 활성이 감소하는 경향을 나타내었다. TiO2의 O/Ti mole ratio는 1.32∼1.79의 범위에서 우수한 활성을 나타내었으며, TiO2의 pH의 경우 SCR 활성과 영향이 없음을 확인하였다. 우수한 SCR 활성을 위해서는 세리아 산화물을 높은 비표면적 및 일정 O/Ti mole ratio를 가진 TiO2에 담지되어야 하고 고분산된 세리아 산화물에 의한 낮은 CeOx surface density를 나타내는 촉매를 제조하여야 한다.
Ceria supported on various commercial TiO2 catalysts were prepared by wet-impregnation method. We confirmed that the correlation between physicochemical properties of TiO2 supports and SCR activities. Physicochemical properties of the various TiO2 were evaluated using X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) surface area, X-ray photoelectron spectroscopy (XPS), and pH analysis. Ce/Ti catalyst exhibited different SCR activities with respect to physicochemical properties of TiO2. An excellent activity was obtained as the surface area of TiO2 increased. In the case of CeOx surface density, the excellent activity in a range of 2.5∼14.5 CeOx/nm2 was achieved and the activity tended to decrease above 14.5 CeOx/nm2. The O/Ti mole ratio of TiO2 in the range of 1.32 to 1.79 showed an excellent SCR activity. It was also confirmed that the pH of the TiO2 has no effects on the SCR activity. In order to achieve excellent SCR activities, ceria oxide should be supported on TiO2 possessing a high specific surface area and certain O/Ti mole ratio. In addition, the catalyst with the low CeOx surface density resulted from the high dispersed ceria oxide should be prepared.
Keywords:NH3-SCR;Ce/TiO2;ceria;NOx removal
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