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Cr3+ contained sulfuric acid aqueous solution and β-PbO2/Ti anode were prepared for electrochemical oxidation-distillation desulfurization of straight-run gasoline. Strong oxidant (Cr2O72−) was formed and reacted with organic sulfides. The oxidized sulfides were removed by distillation. Under optimal operating conditions, the desulfurization rate of gasoline reached to 99.16%.β-PbO2/Ti electrode were characterized by XRD and SEM. Model oil was analyzed by FTIR and GC-MS and the possible desulfurization mechanism was proposed. The recycling experiments of the electrolyte showed its excellent stability, but the concentration of H+ in electrolyte should be monitored, since the water will be consumed in electrolysis process, and the over-high H+ concentration is not good for the formation of Cr2O72−. [ABSTRACT FROM AUTHOR]

In this paper, choosing the mixed solution of MnSO4solution and H2SO4as electrolyte, with the progressing of electrolysis reaction, Mn3+was generated as intermediate product, combining with water to produce the oxidation agent MnOOH, which was easy to oxidize the sulfur compounds to generate sulfoxide or sulfone. At the optimal electrochemical oxidation desulfurization conditions, the sulfur content of kerosene decreased from 180 µg/g to 8.87 µg/g and the desulfurization efficiency reached to 95.07%. And the cycle of electrolyte and mechanism of electrochemical oxidation desulfurization has been discussed. [ABSTRACT FROM AUTHOR]

Diesel with S content 624.4 µg/g was directly used, and a constant current of 500 mA was proposed in this work. Emulsification as an enhancement method was used to enhance the interphase mass transfer. After emulsifying electrochemical oxidation–extraction, the sulfur content of diesel decreased to 8.1 µg/g and the desulfurization efficiency reached 98.71 %. On comparingwith the non-emulsifying electrochemical oxidation–extraction, it has a highly efficient deep desulfurization. The analysis also found that the effect of emulsion and non-emulsion extraction desulfurization process on electrochemical oxidation has great difference under the same operating conditions, and parameters such as the order, reaction rate and activation energy of the two kinds of oxidation desulfurization reaction were studied. The results showed the oxidative desulfurization reaction is the first reaction. When the temperature reachedT2, the oxidation rate constant of the emulsion/non-emulsion system was 0.0199 min−1and 0.0179 min−1, respectively. When the temperature reachedT1, the oxidation rate constant of the emulsion/non-emulsion system was 0.0375 min−1and 0.0346 min−1, respectively. According to Arrhenius' law, the apparent activation energy of sulfur compounds in the raw oil isEa(emulsion) = 6.9783 kJ/mol andEa(non-emulsion) = 9.1826 kJ/mol, respectively. [ABSTRACT FROM AUTHOR]

An electrochemical oxidation−distillation method with constant current 500 mA was proposed to reduce the sulfur content in gasoline in this work. After electrochemical oxidation−distillation, the sulfur content of gasoline decreased from 514.65 to 10.20 μg/g. On the basis of these experimental results, an oxidation mechanism of electrochemical oxidative desulfurization for gasoline was proposed. [ABSTRACT FROM PUBLISHER]