Acta Phys. -Chim. Sin. ›› 2012, Vol. 28 ›› Issue (01): 184-188.doi: 10.3866/PKU.WHXB201111162

• CATALYSIS AND SURFACE SCIENCE • Previous Articles     Next Articles

Effect of Surface Structure of α-Fe2O3 on the Selective Catalytic Reduction of NO by NH3

YANG Xing-Ye1,2, LI Bin1, SUN Liang2, HUANG Zhi-Wei2, CHENG Xiao-Min1, ZHANG Tao-Wei1, TANG Xing-Fu2   

  1. 1. School of Chemical and Engineering and Environment, North University of China, Taiyuan 030051, P. R. China;
    2. Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, P. R. China
  • Received:2011-09-13 Revised:2011-11-14 Published:2011-12-29
  • Contact: LI Bin, TANG Xing-Fu E-mail:libin4y@163.com; tangxf@fudan.edu.cn

Abstract: α-Fe2O3 samples with nanocube and nanorod morphologies were synthesized by a simple hydrothermal route. The samples were characterized by powder X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), high-resolution transmission electron microscopy (HRTEM), temperature- programmed reduction by H2 (H2-TPR), and temperature-programmed desorption of NO (NO-TPD), and tested for the selective catalytic reduction with NH3 (NH3-SCR) of NO at moderate temperatures. The α-Fe2O3 nanocubes possessed predominantly exposed {012} faces with low surface energy, while the nanorods also had some high energy {110} faces exposed. The catalytic activities of the α-Fe2O3 samples were predominantly governed by their surface structures. The nanorods showed much higher activity than the nanocubes under identical conditions, consistent with the better redox properties of the nanorods as confirmed by H2-TPR and NO-TPD measurements. Therefore, α-Fe2O3 nanorods with exposed high energy faces have much higher activity for NH3-SCR than nanocubes with exposed low energy faces under identical reaction conditions.

Key words: NO, α-Fe2O3, Selective catalytic reduction by NH3, Surface structure effect

MSC2000: 

  • O643