Abstract
We studied the catalytic performance of vanadium catalyst promoted with cerium and cesium for sulfur dioxide oxidation. The catalyst samples were characterized by FT-IR, Raman, XRD, SEM, BET and XPS. The results showed that the properties of the catalyst promoted with 4 wt% CeO2 and 7 wt% Cs2SO4 were superior to the commercial V2O5-K2SO4/SiO2 and V2O5-K2SO4-Cs2SO4/SiO2 catalysts, in terms of low temperature activity, thermal stability, SO2 oxidation efficiency and ignition temperature. The FT-IR, Raman, XRD and XPS results evidenced the formation of V2O5-Cs2S2O7 pyrosulfate, CeVO4 and CeO2 crystalline phase in V2O5-K2SO4-Cs2SO4-CeO2/SiO2 catalyst These crystalline phases play an important role in redox reaction at low temperature and can increase the available oxygen for the redox reaction. The characterization results also showed that cerium can promote the formation of pyrosulfate, increase the proportion of large macropores, and improve stability of VV at high temperature. Due to its excellent low-temperature and high-temperature activity, the V2O5-K2SO4-Cs2SO4-CeO2 /SiO2 catalyst appears to be more efficient for the conversion of SO2 in a larger concentration range.
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