Catalytic oxidation of DBT for ultra-deep desulfurization under MoO3 modified magnetic catalyst: The comparison influence on various morphologies of MoO3

[Display omitted] •MoO3 modified magnetic catalysts were synthesized and characterized.•Different morphologies of MoO3 in catalytic system were compared in the ODS process.•The fibroid MoO3 in the catalyst showed an excellent ODS efficiency.•The catalyst can be easily recovered and reused by the external magnetic field. In this work, deep oxidative desulfurization was attained using a new kind MoO3 modified magnetic catalysts, in which metal organic framework (MOF-199) as supports and the magnetic Fe3O4 added to provide the extra character for increasing practical use value. The characterization of the as-designed catalysts were assessed by FT-IR, XRD, SEM, TPR and XPS analyses. To be noted, various morphologies of MoO3 were used to form the final products and compared to discuss their influences on the ODS performance in this work. Among them, the Fe@Mo-4@MOF, containing the fibroid MoO3, showed an excellent catalytic performance to the ultra-deep oxidative desulfurization in 45 min, which was mainly attributed to the special morphology of MoO3, providing the higher contact area with the DBT to increase the ODS efficiency. Moreover, the possible mechanism was proposed to illustrate the ODS process and only slight decrease of DBT removal was observed after 15 recycling times.