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Citation: DONG Guo-jun, ZHAO Yuan, ZHANG Yu-feng. Preparation and performance of V-W/x(Mn-Ce-Ti)/y(Cu-Ce-Ti)/cordierite catalyst by impregnation method in sequence for SCR reaction with urea[J]. Journal of Fuel Chemistry and Technology, ;2014, 42(9): 1093-1101. shu

Preparation and performance of V-W/x(Mn-Ce-Ti)/y(Cu-Ce-Ti)/cordierite catalyst by impregnation method in sequence for SCR reaction with urea

  • 1.

    College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China

  • Corresponding author: DONG Guo-jun, 
  • Received Date: 11 April 2014
    Available Online: 14 June 2014

    Fund Project: Supported by Fundamental Research Funds for the Central Universities (HEUCF20136910012) (HEUCF20136910012)

  • Mn-Ce/TiO2 (M) and Cu-Ce/TiO2 (C) were prepared by sol-gel method, and the cordierite honeycomb ceramics (CC) was coated with M and/or C and V2O5-WO3 in sequence by impregnation method. A series of monolith catalysts were evaluated for the selective catalytic reduction (SCR) of NOx by urea. The physical and chemical properties of the catalysts were well examined using nitrogen adsorption, CO2-TPD, NH3-TPD, XRD, XPS and H2-TPR experiments. The results showed that when the M phase was coated onto catalyst prior to C phase, the complex catalyst V/3C/3M/CC was more active than the catalysts with only M or C phase in the presence of 0.01% SO2 and 10% H2O, and a small quantity of SO2 may favor the urea-SCR activity. XRD analysis indicated that Cu, Ce modified TiO2 sol favors the formation of anatase phase, and Mn, Ce modified TiO2 sol facilitates the formation of rutile phase. The BET surface area of catalyst only has relationship with the amount of M or C phase, and loading sequence does not influence it so much. The introduction of M phase and C phase increases the surface acid sites of different intensity. H2-TPR results showed the interaction between vanadium and copper and/or manganese species enhances the reduction of vanadium, which can increase the amount of H2 consumption. XPS results indicated that both high V4+/V5+ ratio and large amount of surface chemisorbed oxygen may beneficial to the activity of the catalysts.
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