Achieving efficient toluene oxidation over metal–organic framework-derived Pt/CeO2-Co3O4 catalyst

Pt/CeO2-Co3O4 catalyst (Pt/CeCo) was prepared by anchoring Pt species on the CeO2-Co3O4 support that derived from metal-organic framework precursor. The Pt/CeCo catalyst exhibited an eminent toluene catalytic activity compared with Pt/Co3O4. The improvement of catalytic performance for Pt/CeCo catalyst was attributed to surface Co3+ sites and Pt0 species by the enhanced SMSI, where Co3+ sites were benefical for the toluene activation and Pt0 species were conducive to oxygen activation. Moreover, the high mobility of surface active oxygen, excellent low-temperature reducibility and plentiful oxygen vacancies further ensured the exceptional catalytic performance. The in situ DRIFTS demonstrated that the ring-opening of benzoic acid into maleic anhydride was the rate-determining step and that the Pt/CeCo catalyst underwent an accelerated toluene oxidation process compared with Pt/Co3O4 catalyst.