Low-temperature activity and mechanism of WO3-modified CeO2-TiO2 catalyst under NH3-NO/NO2 SCR conditions

doi:10.1016/S1872-2067(18)63129-8

Abstract

Abstract:

The CeO₂-TiO₂ (CeTi) and CeO₂/WO₃-TiO₂ (CeWTi) catalysts were prepared by a sol-gel precipitation method and their NH₃-NO/NO₂ selective catalytic reduction (SCR) performance was studied. N₂O formation and effect of oxygen concentration on SCR performance over CeWTi catalyst were also investigated while varying the NO₂/NO_x ratio. Results indicate that fast SCR behavior of CeWTi catalyst has the best NH₃-NO/NO₂ SCR performance due to the catalyst reoxidation rate by NO₂ higher than by O₂. Compared with CeTi catalyst, CeWTi catalyst exhibits higher de-NO_x performance under NH₃-NO/NO₂ SCR conditions. As the CeTi and CeWTi catalysts exhibit similar redox property, addition of WO₃ provides more acid sites which accelerate the reaction between NH₄NO₃ and NO to get a superior low-temperature activity. Amount of N₂O formation shows a peak at 250℃ mainly derived from NH₄NO₃ decomposition.

Key words: NH₃-NO/NO₂selective catalytic reduction, CeWTi catalyst, Surface acidity, NH₄NO₃, Reaction mechanism

Lei Chen, Ding Weng, Jiadao Wang, Duan Weng, Li Cao. Low-temperature activity and mechanism of WO₃-modified CeO₂-TiO₂ catalyst under NH₃-NO/NO₂ SCR conditions[J]. Chinese Journal of Catalysis, 2018, 39(11): 1804-1813.

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Low-temperature activity and mechanism of WO₃-modified CeO₂-TiO₂ catalyst under NH₃-NO/NO₂ SCR conditions

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