Oxidative desulfurization of dibenzothiophene and diesel over [Bmim] _3PMo_(12)O_(40)

摘要

A hybrid material ([Bmim]_3PMo_(12)O_(40)) was synthesized by reacting H3PMo_(12)O_(40) with the ionic liquid 1-butyl-3-methyl imidazolium bromide. SiO2-supported [Bmim]3PMo_(12)O_(40) showed a high catalytic activity in the oxidation of dibenzothiophene (DBT) with 29% H2O 2 aqueous solution as the oxidant. Maximum activity was observed at a loading of 20 wt.% [Bmim]3PMo_(12)O_(40) on SiO 2, and 100% DBT conversion was achieved at 60 °C, atmospheric pressure, and an oxygen to sulfur (O/S) molar ratio of 3.0 in 100 min. The high performance of [Bmim]3PMo_(12)O_(40)/SiO2 might be attributable to its amphiphilicity, which enhances adsorption of both H2O2 and sulfur-containing compounds. [Bmim] 3PMo_(12)O_(40)/SiO2 could be easily separated by centrifugation and reused without deactivation after seven runs. Quinoline and carbazole had slightly positive effects on DBT oxidation, whereas indole had a negative effect. The high performance of [Bmim]3PMo 12O40 was verified in the sulfur removal from a real diesel by means of oxidation followed by dimethylformamide extraction.