An efficient and recyclable polyoxometalate-based hybrid catalyst for heterogeneous deep oxidative desulfurization of dibenzothiophene derivatives with oxygen

Abstract

A heterogeneous catalyst of [C₃H₃N₂(CH₃)(C₄H₈)]₅PMo₁₀V₂O₄₀ ([C₄mim]₅PMo₁₀V₂O₄₀) was synthesized by a self-assembly method, and characterized by X-ray diffraction (XRD), Scanning Electron Microscopy (SEM), Fourier Transform Infrared Spectroscopy (FT-IR) and Proton Nuclear Magnetic Resonance (¹H NMR). The catalyst exhibited a high desulfurization efficiency of 93.4% sulfur removal rate in the oxidative desulfurization of dibenzothiophene (DBT) with molecular oxygen. A possible reaction mechanism for DBT oxidation is proposed.