In this study, an efficient simultaneous extraction-oxidation catalytic system for deep desulfurization of a model fuel was investigated. For this purpose, mono lacunary phosphomolybdate (PMo11) was synthesized, then a series of PMo11 catalysts supported on mesoporous silica material (KIT-6). Structural characterization of the catalysts were performed by various techniques such as SEM, TEM, FT-IR, FT-Raman, ICP, BET and XRD. The results of the XRD and SEM analysis showed that the synthesized PMo 11 has a semi-crystalline structure. The BET results showed that by increasing the loading of the PMo 11 on the the KIT-6 substrate, the specific catalyst surface decreased. It was observed that the catalyst with 30%PMo11 loading, had the most catalytic activity to remove dibenzothiophene in the oxidative desulfurisation process. In this catalyst system, the reaction was studied under various conditions such as temperature, oxidizing value, catalyst quantity, and solvent extraction type. Under optimal conditions, dibenzothiophene was eliminated to over 92%. The catalyst could be recycled 4 times without significant reduction in catalytic activity.