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http://dx.doi.org/10.5012/bkcs.2013.34.1.225

Deep Desulfurization of Fuels by Heteropolyanion-Based Ionic Liquid  

Li, Jinlei (School of Chemical and Environmental Engineering, Hubei University of Technology)
Hu, Bing (School of Chemical and Environmental Engineering, Hubei University of Technology)
Hu, Chuanqun (School of Chemical and Environmental Engineering, Hubei University of Technology)
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Abstract
A new heteropolyanion-based ionic ($[Hmim]_5PMo_{10}V_2O_{40}$) was synthesized by the reaction of molybdovanadophosphoric acid ($H_5PMo_{10}O_{40}$) with N-methylimidazole. [$[Hmim]_5PMo_{10}V_2O_{40}$ showed a high catalytic activity in the oxidative desulfurization of sulfur-containing compounds in 1-methylimidazolium tetrafluoroborate ($[Hmim]BF_4$) ionic liquid using 30% aqueous $H_2O_2$ as the oxidant. The catalytic system was of high activity, simplified workup and flexible recyclability. The catalytic oxidation reactivity of sulfur-containing compounds decreased in the order dibenzothiophene (DBT) > 4,6-dimethyldibenzothiophene (4,6-DMDBT) > benzothiophene (BT). The influences of various parameters including reaction time (t) and temperature (T), catalyst dosage, and oxidant to sulfur molar ratio n(O)/n(S) on the desulfurization of model oil were investigated in details. 99.1% of DBT conversion in the model oil was achieved at atmospheric pressure under the optimal conditions: n(O)/n(S) = 4:1, $60^{\circ}C$, 100 min and molar ratio of catalyst to sulfur of 0.062. The ionic liquid can be recycled six times without significant decrease in activity.
Keywords
Oxidative desulfurization; Extraction; Dibenzothiophene; Molybdovanadophosphoric acid; Ionic liquid;
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