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Citation: Rui Yang, Haifeng Huang, Yijie Chen, Xixiong Zhang, Hanfeng Lu. Performance of Cr-doped vanadia/titania catalysts for low-temperature selective catalytic reduction of NO_x with NH₃[J]. Chinese Journal of Catalysis, ;2015, 36(8): 1256-1262. doi: 10.1016/S1872-2067(15)60884-1 shu

Performance of Cr-doped vanadia/titania catalysts for low-temperature selective catalytic reduction of NO_x with NH₃

1.
a College of Biological and Environmental Engineering, Zhejiang University of Technology, Hangzhou 310014, Zhejiang, China;

Corresponding author: Haifeng Huang, Hanfeng Lu,
Received Date: 4 March 2015
Available Online: 6 May 2015
Fund Project: 国家自然科学基金(21107096) (21107096) 浙江省自然科学基金(LY14E080008) (LY14E080008) 浙江省科学技术委员会(2013C03021). (2013C03021)

Cr-V/TiO₂ catalysts with different Cr/V molar ratios for low-temperature selective catalytic reduction (SCR) of NO with NH₃ were prepared by impregnation. The samples were characterized using X-ray diffraction, NH₃ temperature-programmed desorption, H₂ temperature-programmed reduction, and X-ray photoelectron spectroscopy. The results show that doping with Cr ions increased the amounts of weak and medium acid sites on the catalyst surface, as well as the low-temperature reductive capacity for high-valence V ions, and promoted the chemical adsorption of oxygen on the catalyst surface, which enhanced the rate of the SCR reaction. The catalyst with a Cr/V molar ratio of 0.2:0.8 and 10 wt% loading gave the largest amount of weak acid sites and the best NO_x-removing performance, with a NO_x conversion greater than 90% at 160-300 ℃. This catalyst had high stability in the presence of 0.01% SO₂.
- Low temperature,
- Selective catalytic reduction,
- Ammonia,
- Vanadia/titania catalyst,
- Nitrogen oxide removing,
- Sulfur resistance,
- Chromium doping
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沈阳化工大学材料科学与工程学院沈阳 110142

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Performance of Cr-doped vanadia/titania catalysts for low-temperature selective catalytic reduction of NOx with NH3

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通讯作者: 陈斌, bchen63@163.com

Performance of Cr-doped vanadia/titania catalysts for low-temperature selective catalytic reduction of NO_x with NH₃