Preparation of supported VPO catalyst modified by Ce and the investigation of its denitration performance
DAI Bo1, ZHANG Song1, GU Ming-yan1, CHEN Yong1, JIA Yong1,2, SHI De-ming3, XIA Yong-jun3, Hu Jia3
1. School of Energy and Enviroment, Ahhui University of Technology, Maanshan 243032, China;
2. Key Laboratory of Metallurgical Emission Reduction & Resource Recycling(Ministry of Education), Maanshan 243032, China;
3. Anhui Xinchuang Energy & Environmental Protection Science & Techmology Co. Ltd., Maanshan 243071, China
In this paper, the surface acidity and the closely related microstructure of supported vanadium phosphate (VPO/TiO2) were adjusted by Ce. The denitration performance of VPO-Ce/TiO2 was also investigated. The results showed that when the P/V was 1/3, the Ce/V 1/4, the loading of active component 10% and the calcination temperature 400℃, the activity of denitrifying catalyst functioned the best with a de-NOx rate above 96% at temperature range of 250~350℃. The BET results showed that the specific surface area of 0.1VP(0.33)O-Ce(0.25)/TiO2 is 10.74m2/g and it was 58.6% higher than that of 0.1VP(0.33)O/TiO2. The mole ratio of chemisorbed oxygen (Oα) and lattice oxygen (Oβ) Oα/Oβ of 0.1VP(0.33)O/TiO2 was 72% and the Oα/Oβ increased to 85% after Ce doping. Moreover, Ce doping could promote the formation of adjacent V5+ and V4+ and improve the redox performance of catalysts. Ce doping had a great effect on the surface acidity of catalyst and the intensity of Brønsted acidity of catalyst was highest when Ce/V is 1/4, which was consistent with the activity test. With 200x10-6 SO2 and 4vol.% water vapor in the feed gas, the denitration activity of 0.1VP(0.33)O-Ce(0.25)/TiO2 dropped by 20% at most at temperature of 150~300℃ and it hardly decreased when the temperature was above 300℃. There was no sulfate generated on the 0.1VP(0.33)O-Ce(0.25)/TiO2 after the activity test and the catalyst showed excellent resistance ability to SO2 and water vapor.
戴波, 张松, 顾明言, 陈勇, 贾勇, 史德明, 夏勇军, 胡笳. Ce改性钒磷氧催化剂的制备及其脱硝性能研究[J]. 中国环境科学, 2019, 39(1): 126-133.
DAI Bo, ZHANG Song, GU Ming-yan, CHEN Yong, JIA Yong, SHI De-ming, XIA Yong-jun, Hu Jia. Preparation of supported VPO catalyst modified by Ce and the investigation of its denitration performance. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(1): 126-133.
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