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Experimental Research on Mercury Catalytic Oxidation over Ce Modified SCR Catalyst

Yadi Qin, Qiyu Weng, Yuqun Zhuo*

Key Laboratory for Thermal Science and Power Engineering of the Ministry of Education, Department of Energy and Power Engineering, Tsinghua University, Beijing, 100084, China

* Corresponding Author: Yuqun Zhuo. Email: email

(This article belongs to the Special Issue: Advancement of Understanding of PM<sub>2.5</sub> and Hg Emissions and Their Control Technologies for Cleaner Combustion)

Energy Engineering 2022, 119(1), 35-47. https://doi.org/10.32604/EE.2022.015477

Abstract

In order to improve the ability of SCR catalyst to catalyze the oxidation of gaseous elemental mercury, a series of novel Ce modified SCR (Selection Catalytic Reduction, V2O5–WO3/TiO2) catalysts were prepared via two-step ultrasonic impregnation method. The performance of Ce/SCR catalysts on Hg0 oxidation and NO reduction as well as the catalytic mechanism on Hg0 oxidation was also studied. The XRD, BET measurements and XPS were used to characterize the catalysts. The results showed that the pore volume and pore size of catalyst was reduced by Ce doping, and the specific surface area decreased with the increase of Ce content in catalyst. The performance on Hg0 oxidation was promoted by the introduction of CeO2.Ce1/SCR (1%Ce, wt.%) catalyst exhibited the best Hg0 oxidation activity of 21.2% higher than that of SCR catalyst at 350°C, of which the NO conversion efficiency was also higher at 200–400°C. Furthermore, Ce1/SCR showed a better H2O resistance but a slightly weaker SO2 resistance than SCR catalyst. The chemisorbed oxygen and weak absorbed oxygen on the surface of catalyst were increased by the addition of CeO2. The chemisorbed oxygen and weak absorbed oxygen on the surface of catalyst were increased by the addition of CeO2. The Ce1/SCR possed better redox ability compared with SCR catalyst. HCl was the most effective gas responsible for the Hg0 oxidation, and the redox cycle (V4+ + Ce4+ ↔ V5+ + Ce3+) played an important role in promoting Hg0 oxidation.

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APA Style
Qin, Y., Weng, Q., Zhuo, Y. (2022). Experimental research on mercury catalytic oxidation over ce modified SCR catalyst. Energy Engineering, 119(1), 35-47. https://doi.org/10.32604/EE.2022.015477
Vancouver Style
Qin Y, Weng Q, Zhuo Y. Experimental research on mercury catalytic oxidation over ce modified SCR catalyst. Energ Eng. 2022;119(1):35-47 https://doi.org/10.32604/EE.2022.015477
IEEE Style
Y. Qin, Q. Weng, and Y. Zhuo "Experimental Research on Mercury Catalytic Oxidation over Ce Modified SCR Catalyst," Energ. Eng., vol. 119, no. 1, pp. 35-47. 2022. https://doi.org/10.32604/EE.2022.015477



cc This work is licensed under a Creative Commons Attribution 4.0 International License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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