INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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Effect of Element (Ce, Co, La, Sn) Doping on Denitration Activity of V-Mo/TiO2 Catalysts |
WU Yanxia1, LIANG Hailong1, CHEN Xin1, CHEN Chen1, WANG Xianzhong2, DAI Changyou3, HU Liming1, CHEN Yufeng1
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1 Ceramics Science Institute, China Building Materials Academy, Beijing 100024, China 2 Jiangxi Provincial Key Laboratory of Industrial Ceramics, Pingxiang University, Pingxiang 337055, China 3 Ruitai Technology Co., Ltd., Beijing 100024, China |
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Abstract Aseries of V-Mo/TiO2 catalysts were prepared by impregnation method. The effects of vanadium content, molybdenum content and elemental (Ce, Co, La, Sn) doping on the denitrification activity of the catalyst were investigated. The physicochemical properties and structure of the catalyst were characterized by XRD, BET, H2-TPR, NH3-TPD and XPS. The results show that the optimum content of vanadium was 3% and the optimum content of molybdenum was 6%. When Ce, La, Co and Sn were doped into 3%V2O5-6%MoO3/TiO2, the denitration efficiency of the catalyst was obviously improved. Among them, 3%V2O5-6%MoO3-1%SnO2/TiO2 catalyst showed the best denitrification activity and good denitration stability at 180 ℃. After introducing 10vol% H2O and 0.03vol% SO2, it exhibited good resistance to SO2/H2O. This is mainly because the introduced metal element exists in the form of oxide or vanadate, and has a strong interaction with the active component vanadium species, inhibiting the growth of TiO2 crystal grains, and plays a role in refining the particle size of TiO2. A weakly acidic site on the surface of the catalyst is added. At the same time, the number of surface active oxygen and reduced V4+ and Mo4+ species has been greatly improved, which enhances the degree of reduction of the catalyst and facilitates the catalytic reduction reaction.
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Published: 23 March 2021
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Fund:National Key Research and Development Plan (2016YFC0209302) and National Natural Science Foundation of China (21866026). |
About author:: Yanxia Wu received her M.S. degree in June 2014 from Nanjing Tech University in engineering. She worked at China Building Materials Academy since August 2014, focusing on the research of environmentally friendly materials. |
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