An effective oxidative system consisting of hydrogen peroxide, formic acid, and sulfuric acid followed by an extractive stage were\r\nimplemented to remove dibenzothiophene in the simulated fuel oil. The results revealed such a great performance in the case\r\nof H2O2 in the presence of formic and sulfuric acids that led to the removal of sulfur compounds. Sulfuric acid was employed\r\nto increase the acidity of media as well as catalytic activity together with formic acid. The oxidation reaction was followed by a\r\nliquid-liquid extraction stage using acetonitrile as a polar solvent to remove produced sulfones from the model fuel. The impact of\r\noperating parameters including the molar ratio of formic acid to sulfur (nF/nS), hydrogen peroxide to sulfur (nO/nS), and the time\r\nof reaction was investigated using Box-Behnken experimental design for oxidation of themodel fuel. A significant quadraticmodel\r\nwas introduced for the sulfur removal as a function of effective parameters by the statistic analysis.
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