MnOx/Al-SBA-15的结构性质及低温NH3选择性催化还原NOx

doi:10.3866/PKU.WHXB201210094

Abstract

Abstract:

A series of MnO_x/Al-SBA-15 catalysts were prepared by post synthesis methods for lowtemperature selective catalytic reduction (SCR) of NO_x 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 MnO_x/SBA-15 catalyst, and the MnO_x/Al-SBA-15 catalyst with n_Si/n_Al=50 had the highest activity. Characterization results revealed that the doped material MnO_x/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 MnO_x and a stronger surface acidity, the MnO_x/Al(50)-SBA-15 catalyst exhibited higher SCR activity.

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

HUANG Ping, PAN Si-Wei, HUANG Bi-Chun, CHENG Hua, YE Dai-Qi, WU Jun-Liang, FU Ming-Li, LU Sheng-Liang. Structural Properties of MnO_x/Al-SBA-15 in Low-Temperature Selective Catalytic Reduction of NO_x with NH₃[J]. Acta Phys. -Chim. Sin. 2013, 29(01), 176-182. doi: 10.3866/PKU.WHXB201210094

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

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