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Improved Low-Temperature Activity of V2O5-WO3/TiO2 for Denitration Using Different Vanadium Precursors
Gan, Lina1,2; Guo, Feng1; Yu, Jian1; Xu, Guangwen1; Yu, J
2016-02-01
发表期刊CATALYSTS
ISSN2073-4344
卷号6期号:2页码:25
摘要This work tested two V2O5-WO3/TiO2 catalysts with different vanadium precursors for selective catalytic reduction (SCR) of flue gas NO using NH3 at 150-450 degrees C. While catalyst A was prepared using ammonium metavanadate (NH4VO3) through incipient impregnation, catalyst B was made according to the solvothermal method using vanadyl acetylacetonate (VO(acac)(2)) as the vanadium precursor. The catalytic evaluation for denitration was in a laboratory fixed bed reactor using simulated flue gas under conditions of a gas hourly space velocity (GHSV) of 40,000 h(-1) and an NH3/NO molar ratio of 0.8. Without SO2 and water vapor in the flue gas at 200 degrees C, the realized NO conversion was 56% for catalyst A but 80% for B. The presence of 350 ppm SO2 and 10 vol. % water vapor in the flue gas slightly reduced the NO conversion over catalyst B, and its activity was stable in a 108-h continuous test at temperatures varying from 450 degrees C to 220 degrees C. Via fourier transformation infrared spectroscopy (FT-IR) and thermogravimetric (TG) analysis, it was shown that over catalyst B a dynamic balance between the formation and decomposition of ammonium sulfite or sulfate is built possibly at temperatures as low as 220 degrees C. For this catalyst there was a higher surface atomic concentration of vanadium and a higher ratio of V4+/(V4+ + V5+), while the NH3 adsorption test revealed more acidic sites on catalyst B. The study discloses a potentially new approach to prepare a V2O5-WO3/TiO2 catalyst with good performance for SCR of flue gas NO at 220-300 degrees C.
关键词Vanadium Precursor Denitration Scr Low-temperature Acitivity Vanadyl Acetylacetonate
文章类型Article
WOS标题词Science & Technology ; Physical Sciences
DOI10.3390/catal6020025
收录类别SCI
语种英语
关键词[WOS]SELECTIVE CATALYTIC-REDUCTION ; OXIDE CATALYSTS ; SILICA SUPPORT ; MECHANISTIC ASPECTS ; NO ; NH3 ; ADSORPTION ; TITANIA ; AMMONIA ; SCR
WOS研究方向Chemistry
WOS类目Chemistry, Physical
项目资助者International Science and Technology Cooperation Program of China(2013DFA51530) ; strategic priority research program of the Chinese academy of sciences(XDA07030300) ; Japan Society for the Promotion of Science (JSPS)(P15758)
WOS记录号WOS:000371898400013
引用统计
文献类型期刊论文
条目标识符http://ir.ipe.ac.cn/handle/122111/20640
专题研究所(批量导入)
通讯作者Yu, J
作者单位1.Chinese Acad Sci, Inst Proc Engn, State Key Lab Multiphase Complex Syst, Beijing 100190, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
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Gan, Lina,Guo, Feng,Yu, Jian,et al. Improved Low-Temperature Activity of V2O5-WO3/TiO2 for Denitration Using Different Vanadium Precursors[J]. CATALYSTS,2016,6(2):25.
APA Gan, Lina,Guo, Feng,Yu, Jian,Xu, Guangwen,&Yu, J.(2016).Improved Low-Temperature Activity of V2O5-WO3/TiO2 for Denitration Using Different Vanadium Precursors.CATALYSTS,6(2),25.
MLA Gan, Lina,et al."Improved Low-Temperature Activity of V2O5-WO3/TiO2 for Denitration Using Different Vanadium Precursors".CATALYSTS 6.2(2016):25.
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