Citation: Xin Liu, Junhua Li, Xiang Li, Yue Peng, Hu Wang, Xiaoming Jiang, Lanwu Wang. NH₃selective catalytic reduction of NO: A large surface TiO₂ support and its promotion of V₂O₅ dispersion on the prepared catalyst[J]. Chinese Journal of Catalysis, ;2016, 37(6): 878-887. doi: 10.1016/S1872-2067(15)61041-5 shu

NH₃selective catalytic reduction of NO: A large surface TiO₂ support and its promotion of V₂O₅ dispersion on the prepared catalyst

Xin Liu ^a, ,
Junhua Li ^a ,
Xiang Li ^a ,
Yue Peng ^a ,
Hu Wang ^b ,
Xiaoming Jiang ^b ,
Lanwu Wang ^c

a State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China;
b Datang Nanjing Environmental Protection Technology Co., Ltd., Nanjing 211111, Jiangsu, China;
c Huatie Vanadium and Titanium Technology Co., Ltd. Panzhihua 617200, Sichuan, China

Received Date: 5 December 2015
Revised Date: 10 January 2016

Fund Project: This work was supported by the National Natural Science Foundation of China (21325731, 21221004), the National High Technology Research and Development Program of China (863 Program), and the State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex.

A titania support with a large surface area was developed, which has a BET surface area of 380.5 m²/g, four times that of a traditional titania support. The support was ultrasonically impregnated with 5 wt% vanadia. A special heat treatment was used in the calcination to maintain the large surface area and high dispersion of vanadium species. This catalyst was compared to a common V₂O₅-TiO₂ catalyst with the same vanadia loading prepared by a traditional method. The new catalyst has a surface area of 117.7 m²/g, which was 38% higher than the traditional V₂O₅-TiO₂catalyst. The selective catalytic reduction (SCR) performance demonstrated that the new catalyst had a wider temperature window and better N₂ selectivity compared to the traditional one. The NO conversion was >80% from 200 to 450 ℃. The temperature window was 100 ℃ wider than the traditional catalyst. Raman spectra indicated that the vanadium species formed more V-O-V linkages on the catalyst prepared by the traditional method. The amount of V-O-Ti and V=O was larger for the new catalyst. Temperature programmed desorption of NH₃, temperature programmed reduction by H₂ and X-ray photoelectron spectroscopy results showed that its redox ability and total acidity were enhanced. The results are helpful for developing a more efficient SCR catalyst for the removal of NO_x in flue gases.
- V₂O₅-TiO₂ catalyst,
- Denitrification,
- Titania,
- Surface area,
- Dispersibility
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NH₃selective catalytic reduction of NO: A large surface TiO₂ support and its promotion of V₂O₅ dispersion on the prepared catalyst