Boosting low-temperature selective catalytic reduction of NO with NH3 of V2O5/TiO2 catalyst via B-doping

doi:10.1016/j.cjche.2021.04.021

Chinese Journal of Chemical Engineering ›› 2022, Vol. 44 ›› Issue (4): 377-383.DOI: 10.1016/j.cjche.2021.04.021

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Boosting low-temperature selective catalytic reduction of NO with NH₃ of V₂O₅/TiO₂ catalyst via B-doping

Hanghang Li¹, Wei Zhao¹, Licheng Wu¹, Qian Wang¹, Danhong Shang², Qin Zhong³

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

Received:2020-12-31 Revised:2021-03-29 Online:2022-06-18 Published:2022-04-28
Contact: Wei Zhao,E-mail:wzhao@ujs.edu.cn;Qian Wang,E-mail:qwang@ujs.edu.cn
Supported by:
This research was funded by the National Natural Science Foundation of China (51506077), the Natural Science Foundation of Jiangsu Province (BK20150488), the Natural Science Foundation of Jiangsu High School (15KJB430007) and the Research Foundation of Jiangsu University (15JDG156).

Boosting low-temperature selective catalytic reduction of NO with NH₃ of V₂O₅/TiO₂ catalyst via B-doping

Hanghang Li¹, Wei Zhao¹, Licheng Wu¹, Qian Wang¹, Danhong Shang², Qin Zhong³

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

通讯作者: Wei Zhao,E-mail:wzhao@ujs.edu.cn;Qian Wang,E-mail:qwang@ujs.edu.cn
基金资助:
This research was funded by the National Natural Science Foundation of China (51506077), the Natural Science Foundation of Jiangsu Province (BK20150488), the Natural Science Foundation of Jiangsu High School (15KJB430007) and the Research Foundation of Jiangsu University (15JDG156).

Abstract

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 NO_x 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 VTiB_2.0 with 2.0% doping amount of B and the NO_x 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.

Key words: B-doping, Catalyst, SCR, NO_x, Support

摘要： 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 NO_x 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 VTiB_2.0 with 2.0% doping amount of B and the NO_x 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.

关键词: B-doping, Catalyst, SCR, NO_x, Support

Hanghang Li, Wei Zhao, Licheng Wu, Qian Wang, Danhong Shang, Qin Zhong. Boosting low-temperature selective catalytic reduction of NO with NH₃ of V₂O₅/TiO₂ catalyst via B-doping[J]. Chinese Journal of Chemical Engineering, 2022, 44(4): 377-383.

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Boosting low-temperature selective catalytic reduction of NO with NH₃ of V₂O₅/TiO₂ catalyst via B-doping

Boosting low-temperature selective catalytic reduction of NO with NH₃ of V₂O₅/TiO₂ catalyst via B-doping

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