Mechanism of the Selective Catalytic Reduction of NOx with NH3 over W-Doped Fe/TiO2 Catalyst

doi:10.1007/s40242-014-4161-4

Abstract

Abstract:

The W-doped Fe/TiO₂ catalyst prepared by an impregnation method exhibited a good NH₃-selective catalytic reduction(SCR) activity and N₂ selectivity with broad operation temperature window. The interaction between Fe and W could increase the amount of surface chemisorbed oxygen, and thus enhances the low temperature SCR activity by facilitating the fast SCR of 2NH₃+NO+NO₂→2N₂+3H₂O. The NH₃-SCR reaction mechanism over the W-Fe/TiO₂ was fully investigated via in situ diffuse reflectance infrared Fourier transform spectroscopy(in situ DRIFTS). In the low temperature range(<250 ℃), the reactive surface species were mainly coordinated NH₃, ionic NH⁺₄ and adsorbed NO₂ species, and the SCR mainly followed the Langmuir-Hinshelwood mechanism, during which the adsorbed NO₂ species became the important active sites. In the high temperature range(>250 ℃), the reactive surface species were mainly NH₂, and the SCR mainly followed the Eley-Rideal mechanism, during which the formation of NH₂NO intermediate species after H-abstraction of NH₃ was the rate-determining step.

Key words: Selective catalytic reduction, Iron, Tungsten, Reaction mechanism

SHU Yun, WANG Hongchang, ZHU Jinwei, ZHANG Fan. Mechanism of the Selective Catalytic Reduction of NO_x with NH₃ over W-Doped Fe/TiO₂ Catalyst[J]. Chemical Research in Chinese Universities, 2014, 30(6): 1005-1010.

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Mechanism of the Selective Catalytic Reduction of NO_x with NH₃ over W-Doped Fe/TiO₂ Catalyst

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