Chinese Journal of Catalysis ›› 2016, Vol. 37 ›› Issue (6): 888-897.DOI: 10.1016/S1872-2067(15)61083-X

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Resistance to SO2 poisoning of V2O5/TiO2-PILC catalyst for the selective catalytic reduction of NO by NH3

Simiao Zang, Guizhen Zhang, Wenge Qiu, Liyun Song, Ran Zhang, Hong He   

  1. Key Laboratory of Beijing on Regional Air Pollution Control; Beijing Key Laboratory for Green Catalysis and Separation; Department of Chemistry and Chemical Engineering, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China
  • Received:2016-01-29 Revised:2016-03-05 Online:2016-05-30 Published:2016-05-30
  • Contact: Wenge Qiu, Hong He
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (21277009, 21577005).

Abstract:

A titania pillared interlayered clay (Ti-PILC) supported vanadia catalyst (V2O5/TiO2-PILC) was prepared by wet impregnation for the selective catalytic reduction (SCR) of NO with ammonia. Compared to the traditional V2O5/TiO2 and V2O5-MoO3/TiO2 catalysts, the V2O5/TiO2-PILC catalyst exhibited a higher activity and better SO2 and H2O resistance in the NH3-SCR reaction. Characterization using TPD, in situ DRIFT and XPS showed that surface sulfate and/or sulfite species and ionic SO42- species were formed on the catalyst in the presence of SO2. The ionic SO42- species on the catalyst surface was one reason for deactivation of the catalyst in SCR. The formation of the ionic SO42- species was correlated with the amount of surface adsorbed oxygen species. Less adsorbed oxygen species gave less ionic SO42- species on the catalyst.

Key words: Selective catalytic reduction, TiO2-pillared clay, Nitrogen oxide, Vanadia catalyst, In situ diffuse reflectance infrared Fourier transform spectroscopy