Metal-organic-frameworks-derived single-atom catalysts are widely used in the catalysis field due to their special structure and superior performance. In general, there is a strong relationship between the precise control of...

In this work, Pt@CeO 2 catalysts with a nanorod structure (Pt@CeO 2 À R) and a bunch structure (Pt@CeO 2 À B) were synthesized through an in-situ encapsulation strategy of Pt species in Ce-MOFs, respectively. It was discovered that the Pt@CeO 2 À R catalyst possessed the best catalytic performance for toluene catalytic combustion, and this result was mainly caused by the confinement of Pt nanoparticles in CeÀ MOFs, which was related to the chemical state of Pt species, redox ability, and the amount of active oxygen species. The Pt@CeO 2 À R catalyst contained more Ce 3 + species, rich Pt 4 + species, and abundant active oxygen species due to the existence of the confined effect, which was conducive to promote catalytic oxidation of toluene. In addition, the Pt@CeO 2 À R catalyst also exhibited more redox ability, which may speed up the catalytic reaction rates. On the contrary, the Pt/CeO 2 À R catalyst was synthesized through a simple impregnation method and exhibited the poor activity for toluene catalytic combustion due to poor Pt 4 + species and active oxygen species. Therefore, this work provides a feasible experimental basis for the study of different morphologies and encapsulated metal nanoparticles.

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