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

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

Lei Chen ^a, ,
Ding Weng ^a ,
Jiadao Wang ^a ,
Duan Weng ^b ,
Li Cao ^b

a State Key Laboratory of Tribology, School of Mechanical Engineering, Tsinghua University, Beijing 100084, China;
b Key Laboratory of Advanced Materials of Ministry of Education, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China

Received Date: 5 May 2018
Revised Date: 22 June 2018

Fund Project: This work was supported by the National Natural Science Foundation of China (51775296, 51375253).

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.
- NH₃-NO/NO₂selective catalytic reduction,
- CeWTi catalyst,
- Surface acidity,
- NH₄NO₃,
- Reaction mechanism
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Low-temperature activity and mechanism of WO₃-modified CeO₂-TiO₂ catalyst under NH₃-NO/NO₂ SCR conditions