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Deep oxidative desulfurization of dibenzothiophene with molybdovanadophosphoric heteropolyacid-based catalysts

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Abstract

Three hydrophobic Keggin-type heteropolyacid catalysts, [C3H3N2(CH3)(C2H4)]5PMo10V2O40 ([C2mim]PMoV), [C3H3N2(CH3)(C4H8)]5PMo10V2O40 ([C4mim]PMoV) and [C3H3N2(CH3)(C6H12)]5PMo10V2O40 ([C6mim]PMoV), were synthesized by reacting molybdovanadophosphoric acid with imidazolium bromides, and characterized by spectroscopic methods. Their use as catalysts in the extractive catalytic oxidative desulfurization process using hydrogen peroxide as the oxidant and acetonitrile as phase transfer agent was studied. The catalytic properties decreased in the order: [C6mim]PMoV > [C4mim]PMoV > [C2mim]PMoV. The main factors influencing the rate of removal of dibenzothiophene (DBT) were investigated, including reaction temperature, the amounts of catalyst, H2O2 and acetonitrile. Nearly 100 % sulfur removal rate was achieved under optimal conditions. The catalyst could be recycled six times with only a slight decrease in activity. A reaction mechanism for DBT oxidation is proposed, in which the Keggin anions first obtain active oxygen from H2O2, then the DBT is oxidized to dibenzothiophene sulfones.

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Acknowledgments

We gratefully acknowledge the financial support of Hubei Provincial Department of Education of China (D20121401) for this work.

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Authors and Affiliations

  1. School of Chemistry and Chemical Engineering, Hubei University of Technology, Wuhan, 430068, People’s Republic of China

    Jiangzhou Zhuang, Bing Hu, Junjun Tan & Xiaoying Jin

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  1. Jiangzhou Zhuang
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  2. Bing Hu
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  3. Junjun Tan
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  4. Xiaoying Jin
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Correspondence to Bing Hu.

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Zhuang, J., Hu, B., Tan, J. et al. Deep oxidative desulfurization of dibenzothiophene with molybdovanadophosphoric heteropolyacid-based catalysts. Transition Met Chem 39, 213–220 (2014). https://doi.org/10.1007/s11243-013-9792-7

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  • DOI: https://doi.org/10.1007/s11243-013-9792-7

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