Acta Phys. -Chim. Sin. ›› 2014, Vol. 30 ›› Issue (6): 1175-1179.doi: 10.3866/PKU.WHXB201404171

• CATALYSIS AND SURFACE SCIENCE • Previous Articles     Next Articles

Selective Catalytic Reduction of NO with NH3 over MnOx-CeO2-WO3-ZrO2：Effect of Calcination Temperature

YU Zai-Lu1, XIE Peng-Fei1, TANG Xing-Fu2, YUE Ying-Hong1, HUA Wei-Ming1, GAO Zi1   

  1. 1 Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Department of Chemistry, Fudan University, Shanghai 200433, P. R. China;
    2 Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, P. R. China
  • Received:2014-03-10 Revised:2014-04-17 Published:2014-05-26
  • Contact: YUE Ying-Hong, HUA Wei-Ming E-mail:yhyue@fudan.edu.cn;wmhua@fudan.edu.cn
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (21273043, 21077026) and Science and Technology Commission of Shanghai Municipality, China (13DZ2275200).

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Abstract:

MnOx-CeO2-WO3-ZrO2 catalysts were prepared by co-precipitation and calcined at various temperatures (500, 600, 700, and 800 ℃). The effect of calcination temperature on their performance in the selective catalytic reduction (SCR) of NO with ammonia in the presence of O2 and H2O was investigated. The structural and physicochemical characterization of the catalysts were performed by N2 adsorption, X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), NH3 temperature-programmed desorption (NH3-TPD), and CO pulse reaction. The results show that the low temperature activity decreased with an increase in the calcination temperature, which is due to a decrease in the amount of surface chemisorbed oxygen and acid sites. As the calcination temperature increased the high temperature activity first increased and then decreased, which is contrary to the variation found for the most readily releasable oxygen on the catalyst surface. The catalyst calcined at 700 ℃ exhibited good low temperature activity and had the widest reaction temperature window. The light-off temperature (50% NO conversion) was 189 ℃ for this catalyst and the NO conversion was 80%-100% between 218 and 431 ℃ at a space velocity of 90000 h-1.

Key words: Nitrogen oxide, Selective catalytic reduction, Manganese oxide, Cerium oxide, WO3-ZrO2, Co-precipitation method