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Received March 6, 2017
Accepted August 15, 2017
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Deep desulfurization of model oil by photocatalytic air oxidation and adsorption using Ti(1.x)MxO2 (M=Zr, Ce)
1School of Chemical Engineering, Beijing Institute of Petrochemical Technology, Beijing 102617, P. R. China 2Beijing Key Laboratory of Fuels Cleaning and Advanced Catalytic Emission Reduction Technology, Beijing 102617, P. R. China 3School of Chemical Engineering, Beijing University of Chemical Engineering, Beijing 100029, P. R. China
licuiqing@bipt.edu.cn
Korean Journal of Chemical Engineering, December 2017, 34(12), 3132-3141(10), 10.1007/s11814-017-0229-4
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Abstract
Deep desulfurization of model oil by photocatalytic air oxidation and adsorption using Ti(1-x)MxO2 (M=Zr, Ce) was investigated. Ti(1-x)MxO2 (M=Zr, Ce) was prepared by urea gelation/co-precipitation method, and characterized by N2 adsorption, XRD and UV-vis spectra. UV irradiation greatly enhanced the adsorptive capacity and selectivity of TiO2-ZrO2 for organosulfur in model oil because organosulfur compounds were first photocatalytically oxidized to sulfoxides and sulfones over TiO2-ZrO2, which were then selectively adsorbed on the bifunctional material due to much higher polarities of generated sulfoxides and sulfones. The Ti/Zr molar ratio and calcination temperature were optimized to 5 : 5 and 500 oC with the sulfur removal of 99.6% after reaction for 2 h under UV irradiation. After adding 25 wt% toluene into model oil, the sulfur removal could still reach 97.2% after reaction for 7 h. TiO2-ZrO2 could be well regenrated by washing with acetonitrile followed by thermal treatment in air.
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