Selective Catalytic Removal of High Concentrations of NO x at Low Temperature

Bo Yu, Qing Liu, Heng Yang, Qichao Li, Hanjun Lu, Li Yang and Fang Liu
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Bo Yu: School of Low Carbon Energy and Power Engineering, China University of Mining and Technology, Xuzhou 221116, China
Qing Liu: School of Low Carbon Energy and Power Engineering, China University of Mining and Technology, Xuzhou 221116, China
Heng Yang: School of Low Carbon Energy and Power Engineering, China University of Mining and Technology, Xuzhou 221116, China
Qichao Li: Huatian Engineering and Technology Corporation, MCC, Nanjing 210004, China
Hanjun Lu: Jiangsu TANZGE Environmental Engineering Co., Ltd., Yancheng 224005, China
Li Yang: School of Low Carbon Energy and Power Engineering, China University of Mining and Technology, Xuzhou 221116, China
Fang Liu: School of Low Carbon Energy and Power Engineering, China University of Mining and Technology, Xuzhou 221116, China

Energies, 2022, vol. 15, issue 15, 1-13

Abstract: Three vanadium-based catalysts were used to remove high concentrations of nitrogen oxides, and the catalysts’ performance of de-NO x and anti-H 2 O under the high concentrations of NO x were investigated. The V-Mo-W/TiO 2 catalysts were tested under 1500 mL/min gas flow (GHSV = 500 h −1 , 2.4% NO 2 , 4.78% NH 3 , 13% O 2 , 4% H 2 O, 5% CO 2 ) and characterized by BET, SEM, EDS, XRD, XPS, H 2 -TPR, and NH 3 -TPD; then, their physical and chemical properties were analyzed. The results showed that under the influence of H 2 O, the NO x conversion of the V-Mo-W/TiO 2 catalysts remained above 97% at 200–280 °C indicating that the catalysts had high catalytic activity and strong water resistance. The analysis of the characterization results showed that the larger specific surface area of the catalyst, the higher acid content, stronger redox ability, and higher V 4+ and V 3+ content were the reasons for the high NO x conversion. The surface area decreased and the microstructure become smoother after the reaction, which may be caused by thermal sintering, but the overall morphology did not change. Comparing the H 2 -TPR and NH 3 -TPD of V 1.6 Mo 1.7 W 1.8 /TiO 2 before and after NH 3 -SCR reaction, it was found that the reduction peak and the intensity of the acid sites of the sample had not changed, which indicated that the catalyst had good anti-sintering performance and a long lifetime. This is significant for followup long-term engineering application experiments.

Keywords: high concentration; NO x; SCR; V-Mo-W; NH 3 (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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