Process compatible desulfurization of new suspension preheater cement production: Rapid catalytic oxidation of trace SO2 over V2O5-based catalysts in preheater environment

Tongsheng Zhang, Hui Peng, Chang Wu, Yiqun Guo, Jiawei Wang, Xinzhi Chen, Jiangxiong Wei, Qijun Yu*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Efficient capture of sulfur dioxide (SO2) in the preheater of the cement production system is the key to achieving process compatible flue gas desulfurization (FGD). Herein, the rapid oxidation of trace SO2 over V2O5-based catalysts in the preheater environment was realized to enhance the SO2 capture capacity of limestone in raw meal, and the catalytic efficiency was further improved by 45.2%, 56.1% and 61.9% after introducing TiO2/MnO2/CeO2 as cocatalysts, respectively. The V2O5-based catalysts had superior catalytic behavior only when the flue gas temperature exceeded 500 °C, while the composition variation of flue gas had a minor influence on SO2 oxidation. Finally, a maximum SO2 oxidation efficiency of 68.1% was achieved in the presence of 4.0% O2, 25.0% CO2 and 15.0% H2O at 600 °C. Furthermore, the mechanism of SO2 catalytic oxidation over V2O5-based catalysts was deduced based on the results of XRD, BET, XPS and Raman, and V5+ was identified as the primary vanadium species for SO2 oxidation. The results provide a deeper insight into the catalytic oxidation of SO2 in the preheater environment, and then facilitate the improvement of process compatible FGD and available dry FGD technologies for cement industry.

Original languageEnglish
Pages (from-to)450-461
Number of pages12
JournalProcess Safety and Environmental Protection
Volume176
Early online date14 Jun 2023
DOIs
Publication statusPublished - Aug 2023

Bibliographical note

Funding Information:
This work was funded by the National Natural Science Foundation of China (No. 52122201 ) and the Guangdong Science and Technology Program ( 2021A0505030008 ). Their financial supports are gratefully acknowledged.

Publisher Copyright: © 2023 The Institution of Chemical Engineers

Keywords

  • Catalytic oxidation
  • Flue gas desulfurization
  • Preheater environment
  • SO2
  • V2O5-based catalysts

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