Metal modified heteropolyacid incorporated into porous materials for a highly oxidative desulfurization of DBT under molecular oxygen

•Mesoporous Metal-POM@MOF-199@MCM-41 was prepared for oxidative desulfurization.•The hybrid catalyst leads to the deep DBT conversion with O2 as oxidation.•Stability is mainly correlated with MOF-199 and MCM-41.•The oxidation of DBT followed pseudo-first-order kinetics.

A kind of composite catalytic materials, Metal-POM@MOF-199@MCM-41 (Metal-PMM), were obtained by confining MOF-199 encapsulating metallic Keggin POM into mesoporous MCM-41. The catalyst was designed on the stability and efficiency, which MCM-41 could act as a stable cavy for the heterogeneous metallic POM-based catalyst in the oxidative desulfurization process. The structure characteristics of the catalysts were elucidated through XRD, IR, XPS, N2 adsorption-desorption, SEM and TEM. The reaction rate could be greatly enhanced, up to 99.1%, under Co-PMM as catalyst and O2 as oxidant. After reaction, the catalyst can be simply recovered and reused more than 5 times without the change of its structure, for the strongly fixation of MOF-199 and MCM-41 to the metallic modified Keggin POM materials.

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