Catalytic kinetics of oxidative desulfurization with surfactant-type polyoxometalate-based ionic liquids
2013
Zhu, Wenshuai | Zhu, Guopeng | Li, Huaming | Chao, Yanhong | Zhang, Ming | Du, Daolin | Wang, Qian | Zhao, Zhen
Surfactant-type polyoxometalate-based ionic liquids (SPILs), such as [(n-C₈H₁₇)₃NCH₃]₃{PO₄[MoO(O₂)₂]₄}, [(n-C₁₂H₂₅)₃NCH₃]₃{PO₄[MoO(O₂)₂]₄}, [(n-C₈H₁₇)₃NCH₃]₃{PO₄[WO(O₂)₂]₄} and [(n-C₁₂H₂₅)₃NCH₃]₃{PO₄[WO(O₂)₂]₄} have been investigated on their oxidative desulfurization. SPILs were very promising for the desulfurization of DBT in the model oil using H₂O₂ as the oxidant. Supposed mechanism and kinetics studies on the catalytic avtivity of SPIL [(n-C₈H₁₇)₃NCH₃]₃{PO₄[MoO(O₂)₂]₄} revealed that the oxidative desulfurization of organosulfur compounds could present a pseudo first-order kinetic. The reaction rate constant and half-life of DBT oxidation were calculated. Moreover, the catalytic activity for other sulfur-containing compounds increased in the order BT<4, 6-DMDBT<DBT. There is little change for the oxidative desulfurization efficiency of SPIL after 8 recycles. And this work offers an alternative for oxidative desulfurization of actual prehydrotreated fuel as well.
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