3 years ago

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

Confining the Nucleation of Pt to In Situ Form (Pt-Enriched Cage)@CeO2 Core@Shell Nanostructure as Excellent Catalysts for Hydrogenation Reactions
Fan Wang, Xiao Wang, Shuyan Song, Yan Xing, Hongjie Zhang, Jing Pan, Junqi Li, Xianchun Liu, Xiaogang Liu
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.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/adma.201700495

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