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

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

Xuesong Liu ^a,b, ,
Xiaodong Wu ^a,b ,
Tengfei Xu ^a ,
Duan Weng ^a,b ,
Zhichun Si ^b ,
Rui Ran ^a

a. Key Laboratory of Advanced Materials of Ministry of Education, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China;
b. Advanced Materials Institute, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, Guangdong, China

Received Date: 4 February 2016
Revised Date: 14 April 2016

Fund Project: This work was supported by the National Natural Science Foundation of China (51372137) and the National High Technology Research and Development Program of China (863 Program, 2015AA034603).

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.
- V₂O₅/WO₃-TiO₂,
- Silica,
- NH₃-SCR,
- Hydrothermal stability,
- Polymeric vanadia,
- De-NO_x
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Effects of silica additive on the NH₃-SCR activity and thermal stability of a V₂O₅/WO₃-TiO₂ catalyst