Korean Journal of Metals and Materials (대한금속재료학회지)

The Korean Institute of Metals and Materials (대한금속재료학회)
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Effects of Manganese Precursors on MnOx/TiO2 for Low-Temperature SCR of NOx

NOx제거용 MnOx-TiO2 계 저온형SCR 촉매의 Mn전구체에 따른 영향

  • Kim, Janghoon (National Core Research Center for hybrid materials solution, Pusan National University) ;
  • Shin, Byeong kil (School of Materials Science & Engineering, Pusan National University) ;
  • Yoon, Sang hyeon (School of Materials Science & Engineering, Pusan National University) ;
  • Lee, Hee soo (School of Materials Science & Engineering, Pusan National University) ;
  • Lim, Hyung mi (Eco-Composite Materials Center Korea Institute of Ceramic Engineering and Technology) ;
  • Jeong, Yongkeun (National Core Research Center for hybrid materials solution, Pusan National University)
  • 김장훈 (부산대학교 하이브리드 소재 솔루션 국가핵심연구센터) ;
  • 신병길 (부산대학교 재료공학부) ;
  • 윤상현 (부산대학교 재료공학부) ;
  • 이희수 (부산대학교 재료공학부) ;
  • 임형미 (한국세라믹기술원 에코복합소재센터) ;
  • 정영근 (부산대학교 하이브리드 소재 솔루션 국가핵심연구센터)
  • Received : 2011.12.01
  • Published : 2012.03.25
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Abstract

The effects of various manganese precursors for the low-temperature selective catalytic reduction (SCR) of $NO_x$ were investigated in terms of structural, morphological, and physico-chemical analyses. $MnO_x/TiO_2$ catalysts were prepared from three different precursors, manganese nitrate, manganese acetate(II), and manganese acetate(III), by the sol-gel method. The manganese acetate(III)-$MnO_x/TiO_2$ catalyst tended to suppress the phase transition from the anatase structure to the rutile or the brookite after calcination at $500^{\circ}C$ for 2 h. It also had a high specific surface area, which was caused by a smaller particle size and more uniform distribution than the others. The change of catalytic acid sites was confirmed by Raman and FT-IR spectroscopy and the manganese acetate(III)-$MnO_x/TiO_2$ had the strongest Lewis acid sites among them. The highest de-NOx efficiency and structural stability were achieved by using the manganese cetate(III) as a precursor, because of its high specific surface area, a large amount of anatase $TiO_2$, and the strong catalytic acidity.

Keywords

Acknowledgement

Supported by : 지식경제부, 한국연구재단

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