Confining the Nucleation of Pt to In Situ Form (Pt-Enriched Cage)@CeO2 Core@Shell Nanostructure as Excellent Catalysts for Hydrogenation Reactions

Ultrathin (Pt-enriched cage)@CeO₂ core@shell nanostructures are successfully fabricated via a facile hard-template method. It is found that the usage of Pd@Ag@CeO₂ bi-metallic core@shell nanostructure as the hard template plays an important role in avoiding the independent nucleation of Pt metal during the galvanic replacement process between K₂PtCl₄ and Ag components. This unique core@shell samples show extraordinary activity and selectivity for the cinnamaldehyde hydrogenation reaction. It can achieve over 95% conversion with 87% selectivity of hydrocinnamaldehyde in 5 h under 1 atm H₂ pressure. It is considered that such high catalytic performance could be attributed to the densely CeO₂-coated core@shell hybrid form as well as the ultrathin nature of the Pt-enriched cage.

High-quality CeO₂-encapsulated Pt-enriched cages with ultrathin walls are successfully synthesized via a kinetic-controlled process. The products exhibit enhanced catalytic activity and selectivity for cinnamaldehyde hydrogenation reaction among the different CeO₂-based core@shell samples.

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