Boosting low-temperature selective catalytic reduction of NO with NH3 of V2O5/TiO2 catalyst via B-doping |
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Authors: | Hanghang Li Wei Zhao Licheng Wu Qian Wang Danhong Shang Qin Zhong |
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Affiliation: | 1.School of Energy & Power Engineering, Jiangsu University, Zhenjiang 212013, China;2.School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China;3.School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China |
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Abstract: | A series of B-doped V2O5/TiO2 catalysts has been prepared the by sol-gel and impregnation methods to investigate the influence of B-doping on the selective catalytic reduction (SCR) of NOx with NH3. X-ray diffraction, Brunauer-Emmett-Teller specific surface area, scanning electron microscope, X-ray photoelectron spectroscopy, temperature-programmed reduction of H2 and temperature-programmed desorption of NH3 technology were used to study the effect of the B-doping on the structure and NH3-SCR activity of V2O5/TiO2 catalysts. The experimental results demonstrated that the introduction of B not only improved the low-temperature SCR activity of the catalysts, but also broadened the activity temperature window. The best SCR activity in the entire test temperature range is obtained for VTiB2.0 with 2.0% doping amount of B and the NOx conversion rate is up to 94.3% at 210 ℃. The crystal phase, specific surface area, valence state reducibility and surface acidity of the active components for the as-prepared catalysts are significantly affected by the B-doping, resulting in an improved NH3-SCR performance. These results suggest that the V2O5/TiO2 catalysts with an appropriate B content afford good candidates for SCR in the low temperature window. |
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Keywords: | B-doping Catalyst SCR NOx" target="_blank">x')">NOx Support |
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