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Article

Insight into the Promoting Role of Er Modification on SO2 Resistance for NH3-SCR at Low Temperature over FeMn/TiO2 Catalysts

by 1,†, 1,2,*,†, 1, 1, 1, 3, 1,2, 1,2 and 1,2,4,*
1
Marine Engineering College, Dalian Maritime University, Dalian 116026, China
2
Liaoning Research Center for Marine Internal Combustion Engine Energy-Saving, Marine Engineering College, Dalian Maritime University, Dalian 116026, China
3
School of Naval Architecture and Ocean Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
4
School of Electronic and Information Technology, Guangdong Ocean University, Zhanjiang 524088, China
*
Authors to whom correspondence should be addressed.
These authors contributed equally to this work and should be considered co-first authors.
Academic Editor: Feng Gao
Catalysts 2021, 11(5), 618; https://doi.org/10.3390/catal11050618
Received: 13 April 2021 / Revised: 8 May 2021 / Accepted: 10 May 2021 / Published: 11 May 2021
Er-modified FeMn/TiO2 catalysts were prepared through the wet impregnation method, and their NH3-SCR activities were tested. The results showed that Er modification could obviously promote SO2 resistance of FeMn/TiO2 catalysts at a low temperature. The promoting effect and mechanism were explored in detail using various techniques, such as BET, XRD, H2-TPR, XPS, TG, and in-situ DRIFTS. The characterization results indicated that Er modification on FeMn/TiO2 catalysts could increase the Mn4+ concentration and surface chemisorbed labile oxygen ratio, which was favorable for NO oxidation to NO2, further accelerating low-temperature SCR activity through the “fast SCR” reaction. As fast SCR reaction could accelerate the consumption of adsorbed NH3 species, it would benefit to restrain the competitive adsorption of SO2 and limit the reaction between adsorbed SO2 and NH3 species. XPS results indicated that ammonium sulfates and Mn sulfates formed were found on Er-modified FeMn/TiO2 catalyst surface seemed much less than those on FeMn/TiO2 catalyst surface, suggested that Er modification was helpful for reducing the generation or deposition of sulfate salts on the catalyst surface. According to in-situ DRIFTS the results of, the presence of SO2 in feeding gas imposed a stronger impact on the NO adsorption than NH3 adsorption on Lewis acid sites of Er-modified FeMn/TiO2 catalysts, gradually making NH3-SCR reaction to proceed in E–R mechanism rather than L–H mechanism. View Full-Text
Keywords: FeMn/TiO2; Er modification; SCR; SO2 resistance; low temperature FeMn/TiO2; Er modification; SCR; SO2 resistance; low temperature
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MDPI and ACS Style

Du, H.; Han, Z.; Wu, X.; Li, C.; Gao, Y.; Yang, S.; Song, L.; Dong, J.; Pan, X. Insight into the Promoting Role of Er Modification on SO2 Resistance for NH3-SCR at Low Temperature over FeMn/TiO2 Catalysts. Catalysts 2021, 11, 618. https://doi.org/10.3390/catal11050618

AMA Style

Du H, Han Z, Wu X, Li C, Gao Y, Yang S, Song L, Dong J, Pan X. Insight into the Promoting Role of Er Modification on SO2 Resistance for NH3-SCR at Low Temperature over FeMn/TiO2 Catalysts. Catalysts. 2021; 11(5):618. https://doi.org/10.3390/catal11050618

Chicago/Turabian Style

Du, Huan, Zhitao Han, Xitian Wu, Chenglong Li, Yu Gao, Shaolong Yang, Liguo Song, Jingming Dong, and Xinxiang Pan. 2021. "Insight into the Promoting Role of Er Modification on SO2 Resistance for NH3-SCR at Low Temperature over FeMn/TiO2 Catalysts" Catalysts 11, no. 5: 618. https://doi.org/10.3390/catal11050618

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