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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 34, Number 1
BKCSDE 34(1)
January 20, 2013 

Deep Desulfurization of Fuels by Heteropolyanion-Based Ionic Liquid
Jinlei Li, Bing Hu*, Chuanqun Hu
Oxidative desulfurization, Extraction, Dibenzothiophene, Molybdovanadophosphoric acid, Ionic liquid
A new heteropolyanion-based ionic ([Hmim]5PMo10V2O40) was synthesized by the reaction of molybdovanadophosphoric acid (H5PMo10O40) with N-methylimidazole. [Hmim]5PMo10V2O40 showed a high catalytic activity in the oxidative desulfurization of sulfur-containing compounds in 1-methylimidazolium tetrafluoroborate ([Hmim]BF4) ionic liquid using 30% aqueous H2O2 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 oC, 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.
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