Polyoxometalate-based ionic liquids as catalysts for deep desulfurization of fuels |
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Authors: | Wenshuai ZhuWangli Huang Huaming Li Ming ZhangWei Jiang Guangying ChenChangri Han |
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Affiliation: | a School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, PR Chinab School of the Environment, Jiangsu University, Zhenjiang 212013, PR Chinac School of Chemistry and Chemical Engineering, Hainan Normal University, Haikou 571158, PR China |
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Abstract: | In order to obtain the ultra low-sulfur diesel, deep desulfurization of diesel oil has become a vital subject of environmental catalysis studies. Extraction and catalytic oxidation desulfurization (ECODS) system is one of the most promising desulfurization processes. A series of Keggin-type POM-based ionic liquids hybrid materials MIMPS]3PW12O40·2H2O (1-(3-sulfonic group) propyl-3-methyl imidazolium phosphotungstate), Bmim]3PW12O40 (1-butyl 3-methyl imidazolium phosphotungstate), Bmim]3PMo12O40 (1-butyl 3-methyl imidazolium phosphomolybdate) and Bmim]4SiW12O40 (1-butyl-3-methyl imidazolium silicotungstate) have been developed in this study, and the reaction has performed using the POM-ILs materials as catalysts, H2O2 as oxidant, and ionic liquid (IL) as solvent. Through experimental evaluations, MIMPS]3PW12O40·2H2O was found to be the best catalyst, with an S-removal of 100% at 30 °C for 1 h. The main factors affecting the process including temperature, catalyst dosage, and O/S (H2O2/DBT) molar ratio were investigated in detail. Under the optimal conditions, DBT (dibenzothiophene) and 4,6-DMDBT (4,6-dimethyl-dibenzothiophene) could achieve high desulfurization efficiency. Moreover, the reaction system also exhibited high activity in actual diesel oil, which could be reduced from 1113 ppm to 198 ppm. The reaction system could recycle 8-times with a slight decrease in activity. |
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Keywords: | Polyoxometalate-based ionic liquids Oxidative desulfurization Catalysis Characterization |
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