期刊
CHINESE JOURNAL OF CATALYSIS
卷 36, 期 8, 页码 1256-1262出版社
SCIENCE PRESS
DOI: 10.1016/S1872-2067(15)60884-1
关键词
Low temperature; Selective catalytic reduction; Ammonia; Vanadia/titania catalyst; Nitrogen oxide removing; Sulfur resistance; Chromium doping
资金
- National Natural Science Foundation of China [21107096]
- Zhejiang Provincial Natural Science Foundation of China [LY14E080008]
- Commission of Science and Technology of Zhejiang Province [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, H-2 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 NOx-removing performance, with a NOx conversion greater than 90% at 160-300 degrees C. This catalyst had high stability in the presence of 0.01% SO2. (C) 2015, Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved.
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