Solvothermal synthesis of Co-substituted phosphomolybdate acid encapsulated in the UiO-66 framework for catalytic application in olefin epoxidation

Hybrid composites of phosphomolybdic acid@UiO-66 (PMo 12 @UiO-66) and Co-substituted 11 Co@UiO-66) were synthesized using the direct solvothermal method. A variety characterization results demonstrated that acid ) or phosphomolybdate Co) clusters are uniformly dispersed in cages Zr-based metal-organic UiO-66 frameworks. The catalytic properties these hybrid investigated by applying epoxidation olefins with tert -butyl hydroperoxide as oxidant. Compared to PMo @UiO-66, Co@UiO-66 showed a much higher activity was simply recovered filtration reused for at least ten runs without significant loss activity. Particularly, can efficiently convert cyclic like limonenes epoxides, its selectivity 1,2-limonene oxide reached 91% presence radical inhibitor such hydroquinone. excellent stability composite PMo11Co@UiO-66 mainly attributed uniform distribution highly active PMo11Co units within smaller UiO-66, suitable surface polarity facilitating access reagents solvent, strong interface-interactions between polyoxometalate framework. based on high t -BuOOH