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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 March 8, 2012
Accepted June 20, 2012

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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SCR 공정에서 Calcium 성분이 V2O5/TiO2 촉매 활성에 미치는 영향

Effects of Calcium on the Activity of V2O5/TiO2 Catalysts in SCR Processes

김진길 박광희¹ 홍성창¹ 이의동² 강용^†

Jin-Kil Kim Kwang-Hee Park¹ Sung-Chang Hong¹ Eui-Dong Lee² Yong Kang^†

충남대학교 화학공학과, 305-764 대전시 유성구 대학로 99 ¹경기대학교 일반대학원 환경에너지시스템 공학과, 443-760 경기도 수원시 영통구 이의동 산 94-6 ²하나검사기술(주), 465-220 경기도 하남시 초이동 337-10

Department of Chemical Engineering, Chungnam National University, 99 Deahak-ro, Yuseong-gu, Daejeon, 305-764, Korea ¹Department of Environmental Energy Systems Engineering, Graduate school of Kyonggi University, 94-6 San, Iui-dong, Suwon, Gyeonggi-do 443-760, Korea ²HANA I&E, 337-10, Choi-dong, Hanam, Gyeonggi-do, 465-220, Korea

Korean Chemical Engineering Research, October 2012, 50(5), 772-777(6), 10.9713/kcer.2012.50.5.772 Epub 2 October 2012

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Abstract

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.

Keywords

V2O5/TiO2 Selective Catalytic Reduction Catalyst Deactivation NH3-TPD

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