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

Efficient capture of sulfur dioxide (SO 2) 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 SO 2 over V 2 O 5 -based catalysts in the preheater environment was realized to enhance the SO 2 capture capacity of limestone in raw meal, and the catalytic efficiency was further improved by 45.2%, 56.1% and 61.9% after introducing TiO 2 /MnO 2 /CeO 2 as cocatalysts, respectively. The V 2 O 5 -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 SO 2 oxidation. Finally, a maximum SO 2 oxidation efficiency of 68.1% was achieved in the presence of 4.0% O 2 , 25.0% CO 2 and 15.0% H 2 O at 600 °C. Furthermore, the mechanism of SO 2 catalytic oxidation over V 2 O 5 -based catalysts was deduced based on the results of XRD, BET, XPS and Raman, and V5+ was identified as the primary vanadium species for SO 2 oxidation. The results provide a deeper insight into the catalytic oxidation of SO 2 in the preheater environment, and then facilitate the improvement of process compatible FGD and available dry FGD technologies for cement industry. [Display omitted] • V 2 O 5 co-catalyzed by TiO 2 /MnO 2 /CeO 2 were prepared for rapid oxidation of trace SO 2. • Catalytic efficiency of V 2 O 5 -based catalysts was investigated. • Factors influencing the oxidation efficiency of trace SO 2 were studied. • 68.1% of SO 2 was oxidized in preheater environment within 1.0 s • Catalytic mechanism and pathways of SO 2 oxidation were proposed. [ABSTRACT FROM AUTHOR]