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

doi:10.1016/S1872-2067(15)60884-1

Chinese Journal of Catalysis ›› 2015, Vol. 36 ›› Issue (8): 1256-1262.DOI: 10.1016/S1872-2067(15)60884-1

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

Rui Yang^a, Haifeng Huang^a, Yijie Chen^a, Xixiong Zhang^a, Hanfeng Lu^b

a College of Biological and Environmental Engineering, Zhejiang University of Technology, Hangzhou 310014, Zhejiang, China;
b Institute of Catalytic Reaction Engineering, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, Zhejiang, China

Received:2015-03-04 Revised:2015-05-06 Online:2015-07-29 Published:2015-07-30
Supported by:
This work was supported by the National Natural Science Foundation of China (21107096), the Zhejiang Provincial Natural Science Foundation of China (LY14E080008), and the Commission of Science and Technology of Zhejiang Province (2013C03021).

Abstract

Abstract:

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.

Key words: Low temperature, Selective catalytic reduction, Ammonia, Vanadia/titania catalyst, Nitrogen oxide removing, Sulfur resistance, Chromium doping

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.

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

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