Acta Phys. -Chim. Sin. ›› 2013, Vol. 29 ›› Issue (01): 176-182.doi: 10.3866/PKU.WHXB201210094

• CATALYSIS AND SURFACE SCIENCE • Previous Articles     Next Articles

Structural Properties of MnOx/Al-SBA-15 in Low-Temperature Selective Catalytic Reduction of NOx with NH3

HUANG Ping1, PAN Si-Wei2, HUANG Bi-Chun1,3, CHENG Hua1, YE Dai-Qi1,3, WU Jun-Liang1,3, FU Ming-Li1,3, LU Sheng-Liang4   

  1. 1 College of Environmental Science & Engineering, South China University of Technology, Guangzhou 510006, P. R. China;
    2 Electric Power Research Institute of Guangdong Power Grid Corporation, P. R. China;
    3 Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control, Guangzhou 510006, P. R. China;
    4 Guangzhou Environment Protection Investment Co. Ltd., Guangzhou 510700, P. R. China
  • Received:2012-08-13 Revised:2012-10-08 Published:2012-12-14
  • Supported by:

    The project was supported by the Significant Technology Special Plan Project of Guangzhou, China (X2DLB2080501).

Abstract:

A series of MnOx/Al-SBA-15 catalysts were prepared by post synthesis methods for lowtemperature selective catalytic reduction (SCR) of NOx with NH3. Structural properties and catalytic performance were comprehensively characterized by Fourier transform infrared (FTIR) spectroscopy, N2 adsorption-desorption, X-ray powder diffraction (XRD), scanning electron microscopy (SEM), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), and temperature programmed desorption of NH3 (NH3-TPD). The results showed that moderate addition of Al improved the SCR activity of the MnOx/SBA-15 catalyst, and the MnOx/Al-SBA-15 catalyst with nSi/nAl=50 had the highest activity. Characterization results revealed that the doped material MnOx/Al-SBA-15 catalysts maintained high specific surface area, large pore volume, and uniform pore size. Al doping improved the concentration and valence state of Mn, where MnO2 was determined to be the main active phase. Owing to a high dispersion of MnOx and a stronger surface acidity, the MnOx/Al(50)-SBA-15 catalyst exhibited higher SCR activity.

Key words: Acetyl acetone manganese, Aluminum, SBA-15, High dispersion, Surface acidity, Selective catalytic reduction

MSC2000: 

  • O643