Citation: GUO Feng, YU Jian, MU Yang, CHU Mo, XU Guang-wen. Preparation of catalyst with wide working-temperature and the reaction mechanism of flue gas denitration[J]. Journal of Fuel Chemistry and Technology, ;2014, 42(1): 101-109. shu

Preparation of catalyst with wide working-temperature and the reaction mechanism of flue gas denitration

GUO Feng ^1,2 ,
YU Jian ^2,, ,
MU Yang ² ,
CHU Mo ¹ ,
XU Guang-wen ^2,,

1.
1. School of Chemical and Environmental Engineering, China University of Mining & Technology, Beijing 100083, China;

Corresponding author: YU Jian, XU Guang-wen,
Received Date: 3 May 2013
Available Online: 5 July 2013
Fund Project: 国家自然科学基金(21106156) (21106156)国家高技术研究发展计划(863计划,2010AA065004) (863计划,2010AA065004)国际合作项目(2013DFA51530) (2013DFA51530)中国科学院战略性先导科技专项(XDA07030300)。 (XDA07030300)

The V₂O₅-WO₃/TiO₂ catalyst using the mesoporous support of TiO₂ made by sol-gel method was prepared with two-step impregnation method and tested for the selective catalytic reduction (SCR) of NO by NH₃. The characterization of the catalyst with BET, NH₃-TPD, H₂-TPR, SEM, activity evaluation and in-situ FT-IR was made to have a deep understanding of the structure, acidity, redox property, catalytic performance, de-NO_x activity and the reaction mechanism. The mesoporous TiO₂ has a surface area of 158.6 m²/g, and the prepared de-NO_x catalyst has a slightly decreased surface area of 136.7 m²/g. The V₂O₅-WO₃/TiO₂ catalyst enables the NO conversions to reach to about 80% at 250~400 ℃ and φ_NH₃/φ_NO = 0.8, showing the feature of wide working-temperature for the catalyst. The surface adsorption of reactants characterized by in-situ FT-IR shows that NH₃ is adsorbed on both the Lewis and Brnsted acidic sites to generate a few different transformation species. The transformation from NH₃ to NH₂ is the rate-determining step for de-NO_x reaction in NH₃-SCR. It is found that the NH₃-SCR reaction occurs between the adsorbed NH₃ and gaseous NO, which follows the Eley-Rideal reaction mechanism.
- selective catalytic reduction,
- de-NO_x,
- in-situ FT-IR,
- NH₃ adsorption,
- reaction mechanism
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