Polyoxometalate Dicationic Ionic Liquids as Catalyst for Extractive Coupled Catalytic Oxidative Desulfurization

Wettability is an important factor affecting the performance of catalytic oxidative desulfurization. In order to develop efficient catalyst for extractive coupled desulfurization (ECODS) fuel oil by H2O2 and acetonitrile, a novel family imidazole-based polyoxometalate dicationic ionic liquids (POM-DILs) [Cn(MIM)2]PW12O40 (n = 2, 4, 6) was synthesized modifying phosphotungstic acid (H3PW12O40) with double imidazole liquid. These kinds catalysts have good dispersity in phase H2O2, which conducive deep oil. The studied under different conditions removing aromatic sulfur compound dibenzothiophene (DBT) from model Results showed that [C2(MIM)2]PW12O40 had excellent efficiency, more than 98% DBT removed optimum conditions. addition, it also exhibited recyclability, activity no significant decline after seven reaction cycles. Meanwhile, sulfone (DBTO2), only oxidation product DBT, confirmed Gas Chromatography-Mass Spectrometry (GC-MS), possible mechanism ECODS process proposed.