Effects of silica additive on the NH3-SCR activity and thermal stability of a V2O5/WO3-TiO2 catalyst

doi:10.1016/S1872-2067(15)61109-3

Abstract

Abstract:

V₂O₅/WO₃-TiO₂ and V₂O₅/WO₃-TiO₂-SiO₂catalysts were prepared by a wetness impregnation method, and both the catalysts were hydrothermally aged at 750 ℃ in 10 vol% H₂O/air for 24 h. The catalysts were evaluated for NO_x conversion using NH₃ as the reductant. Hydrothermal ageing decreased the NO_x conversion of V₂O₅/WO₃-TiO₂ catalyst severely over the entire measured temperature range. Interestingly, the NH₃-SCR activity of the silica-modified catalyst at 220-480 ℃ is enhanced after ageing. The catalysts were characterized by X-ray diffraction, nitrogen adsorption, X-ray fluorescence, Raman spectroscopy, H₂ temperature-programmed reduction, and NH₃ temperature-programmed desorption. The addition of silica inhibited the phase transition from anatase to rutile titania, growth of TiO₂ crystallite size and shrinkage of catalyst surface area. Consequently, the vanadia species remained highly dispersed and the hydrothermal stability of the V₂O₅/WO₃-TiO₂ catalyst was significantly improved.

Key words: V₂O₅/WO₃-TiO_2, Silica, NH₃-SCR, Hydrothermal stability, Polymeric vanadia, De-NO_x

Xuesong Liu, Xiaodong Wu, Tengfei Xu, Duan Weng, Zhichun Si, Rui Ran. Effects of silica additive on the NH₃-SCR activity and thermal stability of a V₂O₅/WO₃-TiO₂ catalyst[J]. Chinese Journal of Catalysis, 2016, 37(8): 1340-1346.

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Effects of silica additive on the NH₃-SCR activity and thermal stability of a V₂O₅/WO₃-TiO₂ catalyst

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