Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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The Activity of Standard and Fast SCR over V-based Catalysts Supported on Various TiO2

다양한 TiO2에 담지된 바나디아 촉매의 표준 및 빠른 SCR 활성

  • Ji Eun Jeong (Department of Environmental Engineering, Kongju National University) ;
  • Yeon Jeong Jo (Department of Environmental Engineering, Kongju National University) ;
  • Inyoung Lee (Korea Electric Power Research Institute Climate Change & Environment Group) ;
  • Jeongkeun Lee (Korea Electric Power Research Institute Climate Change & Environment Group) ;
  • Chang-Yong Lee (Department of Environmental Engineering, Kongju National University)
  • 정지은 (공주대학교 환경공학과) ;
  • 조연정 (공주대학교 환경공학과) ;
  • 이인영 (한국전력연구원 에너지환경연구소) ;
  • 이정근 (한국전력연구원 에너지환경연구소) ;
  • 이창용 (공주대학교 환경공학과)
  • Received : 2023.09.04
  • Accepted : 2023.10.08
  • Published : 2023.12.10
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Abstract

The physicochemical properties of VOx/TiO2 catalysts with different TiO2 supports were analyzed, and SCR reactions were performed. VOx/TiO2 catalysts were prepared by impregnation using anatase TiO2, which was manufactured by Sigma Aldrich and prepared from TiOCl2 and titanium isopropoxide (TTIP) as a precursor. They are denoted as VS, VC, and VP. The specific surface area of the VS was 1/10 or less of that of the VC and VP, and the dispersibility of vanadium oxide was relatively low. As a result of XPS analysis, the ratio of adsorbed oxygen was higher in VS and VP with Ti3+ than in VC. In VC and VP, vanadium mainly existed in V4+ and V3+ states in relation to the dispersibility of vanadium oxide. The amount of adsorbed oxygen contributed more to NH3-SCR activity than vanadium oxide dispersibility below 250 ℃, while vanadium oxide dispersibility contributed more to activity beyond 300 ℃. The fast SCR activity in all three samples was the highest at NO2/NOx = 0.5, followed by VS < VC < VP samples. It was determined that the dispersibility of vanadium oxide had a significant effect on fast NH3-SCR activity.

지지체 TiO2가 다른 VOx/TiO2 촉매들에 대해 특성 분석과 SCR 반응을 수행하였다. Sigma Aldrich 사의 anatase TiO2와 TiOCl2와 TTIP를 출발 원료로 제조한 TiO2를 사용하여 VOx/TiO2 촉매를 제조하고, 이를 각각 VS, VC, VP로 표시하였다. VS 시료의 비표면적은 VC 및 VP 시료 대비 1/10 이하로서 바나듐 산화물의 분산성은 상대적으로 낮았다. XPS 분석 결과, 촉매 표면의 흡착 산소의 비는 Ti3+가 존재하는 VS와 VP 시료가 VC 시료에 비해 높았다. 또한 VC와 VP시료에서 바나듐은 바나듐 산화물의 분산성과 관련하여 주로 V4+와 V3+ 상태로 존재하였다. 250 ℃ 이하 NH3-SCR 활성에는 바나듐 산화물의 분산성보다는 흡착 산소 양이 더 기여한 반면, 300 ℃ 이상 활성에는 바나듐 산화물의 분산성이 더 기여하는 것으로 판단되었다. 촉매들의 fast SCR 활성은 3 시료 모두 NO2/NOx = 0.5에서 가장 높았으며, VS < VC < VP 시료 순으로 나타났다. 빠른 NH3-SCR 촉매 활성에는 촉매의 바나듐 산화물의 분산성이 영향을 크게 미친다고 판단되었다.

Keywords

Acknowledgement

본 연구는 한국전력공사 전력연구원의 재원을 받아 진행되었습니다. (과제번호: R21VJ01)

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