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Effect of Ceria Doping On Catalytic Activity and SO2 Resistance of MnOx/TiO2 Catalysts for Selective Catalytic Reduction of NO with NH3 at Low Temperature

Category: Control Techniques and Strategy

Accepted Manuscripts
DOI: 10.4209/aaqr.2019.10.0546
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To cite this article:
Wang, Q., Zhou, J., Zhang, J., Zhu, H., Feng, Y. and Jin, J. (2020). Effect of Ceria Doping On Catalytic Activity and SO2 Resistance of MnOx/TiO2 Catalysts for Selective Catalytic Reduction of NO with NH3 at Low Temperature. Aerosol Air Qual. Res., doi: 10.4209/aaqr.2019.10.0546.

Qiulin Wang1,2, Jianjian Zhou1, Jianchao Zhang1, Hao Zhu1, Yuheng Feng 3, Jing Jin1,2

  • 1 School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
  • 2 Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
  • 3 Thermal and Environmental Engineering Institute, Tongji University, Shanghai 200092, China

Highlights

  • The surface acidity and redox ability of MnOx /TiO2 is improved by Ce addition.
  • The MnOx -CeO2 /TiO2 catalytic activity is correlated with the exposure of Mn atom.
  • Appropriate amount of Ce increase the surface exposure of Mn atom.
  • The presence of Ce speeds up the reoxidation from Mn3+ to the active Mn4+ species.
  • CeO2 helps enhance the oxygen storage/release capability of MnOx -CeO2 /TiO2 catalyst.

Abstract

Low temperature NH3-SCR of NO is strongly needed due to its availability in industrial furnaces and energy-conserving feature. MnOx-CeO2/TiO2 (MnCe/Ti) with different Ce doping contents were prepared and their catalytic activities for NH3-SCR under 100-400℃ were experimentally examined. The results suggest that addition a small amount of Ce (Ce/Ti mole ratio=0.05) improves the exposure of Mn atoms on catalyst surface and exhibits highest NH3-SCR activity at 100-200℃, on which above 98% of NO is abated at 175℃. Further increase the Ce contents decreases the catalyst performance instead. Moreover, NH3-SCR of NO under oxidizing or reducing conditions confirms the oxygen species bounded to the exposed Mn atoms are easier to be released and the resulted oxygen vacancies are more likely to be replenished by O2 at low temperature. In addition, the SO2 resistance of MnCe/Ti is also enhanced by Ce modification, mainly due to the inhibition of the accumulation of ammonium sulfates and the preferential sulfation of the Ce dopants.

Keywords

MnOx/TiO2 Ce modification Low temperature SCR deNOx SO2 poisoning


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