Korean Chemical Engineering Research, Vol.50, No.5, 772-777, October, 2012
SCR 공정에서 Calcium 성분이 V2O5/TiO2 촉매 활성에 미치는 영향
Effects of Calcium on the Activity of V2O5/TiO2 Catalysts in SCR Processes
E-mail:
초록
장기간 운전되는 선택적 촉매 반응공정(SCR Process)에서 V2O5/TiO2 촉매의 활성저하에 미치는 요소들에 대해 고찰하였다. V2O5/TiO2 촉매의 활성은 공정이 8개월 정도 운전되었을 때 급격히 감소하였다. ICP-AES 분석결과, 공정에서 사용된 V2O5/TiO2 촉매의 활성이 저하되는 것은 선택적 촉매반응공정에서 환원제로 요소용액에 첨가된 칼슘성분에 기인되는 것으로 사료되었다. NH3-TPD 실험결과, 칼슘성분과 같은 강한 염기성 성분은 촉매의 산도에 매우 큰 영향을 미치는 것으로 나타났다. 이와 같은 결과로 비록 농도가 매우 적은 범위라도 칼슘성분이 선택적 촉매 반응공정에서 촉매의 활성도 저하의 원인이 되는 것으로 사료되었다.
Factors acting on the deactivation of V2O5/TiO2 catalysts were investigated in the selective catalytic reduction (SCR) process for long term operation. The activity of V2O5/TiO2 catalysts was decreased rapidly after 8 months from the starting of operation in the selective catalytic reaction processes. From ICP-AES analysis, the deactivation of the used catalysts could be caused from the calcium component included in urea solution as a reducing agent. It was found from the NH3-TPD experiments that the strong basic element like Ca component drastically affected the acidity of the V2O5/TiO2 catalyst. The results gave an explanation on the reason why the component of Ca, even though its concentration is very low, could lead to the deactivation of V2O5/TiO2 catalyst in the selective catalytic reaction processes.
- Bosch H, Janssen F, Catal. Today., 2(4), 369 (1988)
- Forzatti P, Lietti L, Heterogen. Chem. Rev., 3, 33 (1996)
- Alemany LJ, Berti F, Busca G, Ramis G, Robba D, Toledo GP, Trombetta M, Appl. Catal. B: Environ., 10(4), 299 (1996)
- Cho SM, Chem. Eng. Prog., 90(1), 39 (1994)
- Madia G, Elsener M, Koebel M, Raimondi F, Wokaun A, Appl. Catal. B: Environ., 39(2), 181 (2002)
- Saleh RY, Wachs IE, Chan SS, Chersich CC, J. Catal., 98(1), 102 (1986)
- Nikolov V, Anastasov A, Ind. Eng. Chem. Res., 31(1), 80 (1992)
- Gao J, Chen G, Fu X, Yin Y, Wu S, Qin Y, Korean J. Chem. Eng., 29(2), 263 (2012)
- Seo JH, Chae HJ, Kim TW, Jeong KE, Kim CU, Lee SB, Jeong SY, Korean Chem. Eng. Res., 49(6), 726 (2011)
- Tang FS, Xu BL, Shi HH, Qiu JH, Fan YN, Appl. Catal. B: Environ., 94(1-2), 71 (2010)
- Shikada T, Fujimoto K, Chem. Lett., 12, 77 (1983)
- Abu-Ramadan E, Saha K, Li XG, AIChE J., 57(11), 3210 (2011)
- Park KH, Lee JY, Hong SH, Choi SH, Hong SC, J. Korean Ind. Eng. Chem., 19(4), 376 (2008)
- Serwicka EM, Catal. Today, 56(4), 335 (2000)
- Forzatti P, Nova I, Beretta A, Catal. Today, 56(4), 431 (2000)
- Nicosia D, Czekaj I, Krocher O, Appl. Catal. B: Environ., 77(3-4), 228 (2008)
- Krocher O, Elsener M, Appl. Catal. B: Environ., 77(3-4), 215 (2008)
- Nicosia D, Elsener M, Krocher O, Jansohn P, Top.Catal., 42-43(1-4), 333 (2007)
- Lietti L, Appl. Catal. B: Environ., 10(4), 281 (1996)
- Topsoe NY, Science, 265(5176), 1217 (1994)