Yang Zhang1, Zhiqiang Jiang2, Zhengang Zhou1, Yonglong Yang1, Qianwei Feng1, Jianping Jiang1, Zhen Du1, Dong Guo1, Xinrong Yan This email address is being protected from spambots. You need JavaScript enabled to view it.1

1 Huadian Electric Power Research Institute Co., Ltd., Hangzhou 310030, China
2 China Huadian Corporation Ltd., Beijing 100032, China

Received: March 4, 2024
Revised: April 20, 2024
Accepted: May 24, 2024

 Copyright The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.

Download Citation: ||https://doi.org/10.4209/aaqr.240034  

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Cite this article:

Zhang, Y., Jiang, Z., Zhou, Z., Yang, Y., Feng, Q., Jiang, J., Du, Z., Guo, D., Yan, X. (2024). An Investigation of Selective Catalytic Reduction Catalyst SO2/SO3 Conversion in Coal-fired Power Plants. Aerosol Air Qual. Res. 24, 240034. https://doi.org/10.4209/aaqr.240034


  • SCR catalysts in 170 coal-fired power plants were tested and analyzed.
  • SO2/SO3 conversion of SCR catalysts was systematic investigated.
  • SO2/SO3 conversion rates fluctuate within the range of 0.55–1.12%.
  • There are five key impact factors on the SO2/SO3 conversion of SCR catalyst.
  • Tailored measures can be implemented to control SO2/SO3 conversion.


The SO2/SO3 conversion in the selective catalytic reduction (SCR) denitrification system of coal-fired power plants plays a significant role in the generation of SO3. Effectively controlling the conversion rate of SO2/SO3 in the denitrification catalyst can substantially mitigate the hazards associated with SO3. Drawing on 170 SCR catalyst tests, the impact of various factors, including the catalyst's V2O5 content, WO3/MoO3 content, inlet SO2 concentration, inlet flue gas temperature, and area velocity, on the SO2/SO3 conversion was systematically investigated. The findings suggest potential optimization opportunities for the SO2/SO3 conversion rate in the denitrification catalysts currently used in engineering applications. By understanding the influence patterns of key factors, tailored measures such as selecting appropriate performance indicators, designing catalysts for specific projects, and adjusting key operational parameters in coal-fired power plants can be implemented. These measures are aimed at preventing problems like corrosion and blockage in downstream facilities due to SO3 and effectively controlling SO3 emissions.

Keywords: Coal-fired power plant, SCR catalyst, SO2/SO3 Conversion, SO3 emission, Synergistic control

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