LIU Yifeng, SHEN Benxian, PI Zhipeng, et al. Oxidation transferring mechanism of SO2 in FCC flue gas over CeO2 surface[J]. CIESC Journal, 2016, (12): 5015-5023. DOI: 10.11949/j.issn.0438-1157.20160272.
LIU Yifeng, SHEN Benxian, PI Zhipeng, et al. Oxidation transferring mechanism of SO2 in FCC flue gas over CeO2 surface[J]. CIESC Journal, 2016, (12): 5015-5023. DOI: 10.11949/j.issn.0438-1157.20160272.DOI:
To improve efficiency of Ce-based desulfurization agent in deep desulfurization of flue gas in fluid catalytic cracking(FCC) petroleum processing
reaction mechanism of SO2 and O2 over CeO2 surface were investigated in both experiments and calculations by density functional theory(DFT). SO2 removal from simulated flue gas with O2 presence was carried out over CeO2 under 60℃ and 200℃. CeO2 characterization before and after desulfurization by XRD
IR and XPS was used to study changes in valence and relative amount of S and Ce as well as to explore possible oxidative reaction path of SO2. Models of monomolecular O2 adsorption and bimolecular O2 and SO2 adsorption on O-deficient CeO2(111) and MgAl2O4(111) were established from DFT simulation. SO2 oxidation and energy barriers of each reaction step were calculated using LST/QST method. Results indicated that CeO2(111) had better catalytic effect for SO2 desulfurization than MgAl2O4(111) and CeO2 could transport lattice oxygen in oxidation with SO3 desorption as rate-control step.