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Citation: YAN Dong-jie, YU Ya, HUANG Xue-min, LIU Shu-jun, LIU Ying-hui. Poisoning effect of SO2 on Mn-Ce/TiO2 catalysts for NO reduction by NH3 at low temperature[J]. Journal of Fuel Chemistry and Technology, ;2016, 44(02): 232-238. shu

Poisoning effect of SO2 on Mn-Ce/TiO2 catalysts for NO reduction by NH3 at low temperature

  • 1.

    Shaanxi Key Laboratory of Environmental Engineering, College of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China

  • Corresponding author: YAN Dong-jie, 
  • Received Date: 9 June 2015
    Available Online: 14 September 2015

    Fund Project: 国家自然科学基金(51408455) (51408455)陕西省教育厅科研计划(14JK1392)项目资助. (14JK1392)

  • Effects of SO2 on performance of Mn-Ce/TiO2 catalysts were investigated in the selective catalytic reduction of NO with NH3.The catalysts were characterized by BET surface area,X-ray diffraction(XRD),scanning electron microscope(SEM),X-ray photoelectron spectroscopy(XPS),respectively.The results show that SO2 has inhibitory effect on the selective catalytic reduction(SCR),and NOx conversion decreases from 84% to 42% at 140℃.This is mainly because the presence of SO2 results in the decrease of the specific surface area of the catalysis and the pore size distribution of 5-10 nm.SO2 can cause TiO2 transformation from anatase to rutile phase,the crystallization phenomenon of active components MnOx,and the decrease of the strong interaction between Mn and Ti.The variations of physical and chemical properties of poisoned Mn-Ce/TiO2 catalyst block the O2-→O-→O2- conversion path,which reduces the proportion of higher catalytic activity component MnO2 in MnOx,weakens oxygen storage ability of CeOx,and accumulates absorbed oxygen on the catalyst surface decreasing the adsorption and desorption of NO on active sites.Ammonium sulfate formed on the catalyst surface covers the Lewis acid sites and decreases the adsorption amount of NH3.
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