▎ 摘　　要

Catalysts made of Pt nanoparticles dispersed on graphene (X wt% Pt/G, X=2.0, 3.5, and 5.0) were prepared and characterized by XRD, Raman spectroscopy, BET surface area measurements, TEM, and X-ray photoelectron spectroscopy (XPS), and a 3.5 wt% Pt supported on Vulcan Carbon catalyst (3.5 wt% Pt/VC) was included as a reference. Although the mean Pt nano-particle size is approximately 4.4 nm for all X wt% Pt/G and 3.5 wt% Pt/VC catalysts, cinnamal alcohol was produced with high selectivity only with the graphene-supported catalysts: 92% conversion and 88% selectivity toward cinnamal alcohol were obtained with 3.5 wt% Pt/G. This catalyst also showed good stability in recycling tests. The good selectivity observed with the graphene-based catalysts is attributed to the higher fraction of reduced surface Pt-0 atoms seen on the surface of the Pt nanoparticles (determined by XPS). This interpretation is consistent with DFT calculations. Additional p-p interactions between cinnamaldehyde and graphene may also play a role in the selective hydrogenation of cinnamaldehyde.