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Dalton Trans. 2019 Apr 23;48(17):5749-5755. doi: 10.1039/c9dt00203k.

Preparation of core-shell PW12@TiO2 microspheres and oxidative desulfurization performance.

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Department of Chemical Engineering, Chengde Petroleum College, Chengde 067000, P. R. China.


A polyoxometalate-based microsphere catalyst has been prepared through the one-step template method using phosphotungstic acid as the core and TiO2 as the shell, denoted as PW12@TiO2. Multiple characterisation methods namely FT-IR, XRD, XPS, Raman, SEM and TEM were used to characterize the resultant materials, and results indicate that the phosphotungstic acid was encapsulated into the TiO2 phase as the core to form the core-shell structure. The resultant composites were used as catalysts for the oxidative desulfurization of a model oil with H2O2 as oxidant and acetonitrile as solvent. Catalyst PW12@TiO2 exhibited good catalytic activity, with 99.9% S-removal of dibenzothiophene after 60 min under the optimum conditions. Leaching and recycling experiments revealed that the PW12@TiO2 catalyst has excellent recyclability, and there was no significant decrease in S-removal after seven cycles under identical reaction conditions, which could be attributed to the fabrication of the core-shell structure, thus inhibiting the loss in the active sites.


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