Highly Efficient Extraction and Oxidative Desulfurization System Using Na7H2LaW10O36⋅32 H2O in [bmim]BF4 at Room Temperature

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Abstract
Highly efficient, deep desulfurization of model oil containing dibenzothiophene (DBT), benzothiophene (BT), or 4,6‐dimethyldibenzothiophene (4,6‐DMDBT) has been achieved under mild conditions by using an extraction and catalytic oxidative desulfurization system (ECODS) in which a lanthanide‐containing polyoxometalate Na7H2LnW10O36⋅32 H2O (LnW10; Ln=Eu, La) acts as catalyst, [bmim]BF4 (bmim=1‐butyl‐3‐methylimidazolium) as extractant, and H2O2 as oxidant. Sulfur removal follows the order DBT>4,6‐DMDBT>BT at 30 °C. DBT can be completely oxidized to the corresponding sulfone in 25 min under mild conditions, and the LaW10/[bmim]BF4 system could be recycled for ten times with only slight decrease in activity. Thus, LaW10 in [bmim]BF4 is one of the most efficient systems for desulfurization using ionic liquids as extractant reported so far.

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