Kinetics for Oxidation of Dibenzothiophene Catalyzed by Keggin-based Heteropoly Acids/H_2O_2 in bmimBF_4

摘要

Extraction and catalytic oxidative desulfurization (ECODS) could success-fully integrate phosphomolybdic acid (H_3PM0_(12)O_(40)26H_2O, PM0_(12)), hydrogen peroxide (H_2O_2), and 1 -butyl-3-methylimidazolium tetrafluoroborate (bmimBF4) into a single efficient system that was manipulated to facilitate the separation and oxidation of sulfur compounds. The peroxometal complex was formed rapidly as PM0_(12) was oxidized by H_2O_2 and it could be solubilized in hydrophilic ionic liquid. The experimental results showed high sulfur removal up to 99.4 under the optimized desulfurization system. Kinetics of the ECODS system of dibenzothiophene was pseudo first order with the apparent activation energy of 53.8 kJ-mol~(-1). The catalytic reaction system could be recycled eight times without a significant decrease in reaction activity.