Acta Phys. -Chim. Sin. ›› 2009, Vol. 25 ›› Issue (04): 601-605.doi: 10.3866/PKU.WHXB20090427

• Communication • Previous Articles     Next Articles

Removal of NOx Using Novel Fe-Mn Mixed-Oxide Catalysts at Low Temperature

 CHEN Zhi-Hang, LI Xue-Hui, YANG Qing, LI Hua, GAO Xiang, JIANG Yan-Bin, WANG Fu-Rong, WANG Le-Fu   

  1. Guangdong Provincial Key Laboratory for Green Chemical Product Technology, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, P. R. China
  • Received:2008-12-21 Revised:2009-01-19 Published:2009-03-31
  • Contact: LI Xue-Hui E-mail:cexhli@scut.edu.cn

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Abstract:

A series of novel Fe-Mn mixed-oxide catalysts were prepared by a sol-gel method. X-ray diffraction (XRD) was used to characterize the active phase and the effects of the n(Fe)/(n(Fe)+n(Mn) molar ratio as well as the calcination temperature on the catalytic properties were investigated. This catalytic system had good selective catalytic reduction (SCR) properties for NOx by ammonia at low temperatures (80-220 ℃). We achieved 90.6% conversion of NOx with 100% selectivity of N2 on an Fe(0.4)-MnOx mixed oxide (the molar ratio of n(Fe)/(n(Fe)+n(Mn))=0.4 and calcined at 500 ℃) at 80 ℃ with a space velocity of 30000 h-1. XRD characterization results showed that a new Fe3Mn3O8 phase was generated for Fe-MnOx. The oxidation activity of NO to NO2 by O2 on these Fe-MnOx catalysts suggested that the existence of Fe3Mn3O8 was beneficial for an increased oxidation rate of NO to NO2, which improved the activity of low-temperature SCR.

Key words: Fe-Mn mixed-oxide, Low temperature, Selective catalytic reduction, NOx, NH3