Research Article


2018, 11(11): 5902–5912


Composition-tuned oxidation levels of Pt–Re bimetallic nanoparticles for the etherification of allylic alcohols

Yuhao Wang1, Lindong Li1, Ke Wu1, Rui Si2, Lingdong Sun1 (*), and Chunhua Yan1 (*)

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1 Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Rare Earth Materials Chemistry and Applications, PKU-HKU Joint Laboratory in Rare Earth Materials and Bioinorganic Chemistry, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
2 Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201204, China

Keywords: nanocatalysis, Re, Pt, oxidation level, composition, allylic alcohol
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ABSTRACT The catalytic performance of metal nanoparticles is often affected by surface oxidation levels. Instead of post-synthesis oxidation/reduction, we propose an efficient method to modulate the oxidation levels by tuning the composition of bimetallic nanoparticles. Here we report a series of Pt–Re bimetallic nanoparticles synthesized via a facile thermal co-reduction process, with a uniform size of approximately 3 nm. The investigation of the growth of the Pt–Re nanoparticles suggests that the Re atoms were enriched on the surface, as confirmed by X-ray photoelectron spectroscopy. Furthermore, X-ray absorption spectroscopy showed that metallic Re was decreased and high-valency ReOx species were increased in particles with higher Re/Pt ratios. In the etherification of allylic alcohols catalyzed by Pt–Re nanoparticles of different compositions under ambient conditions, particles with higher Re/Pt ratios exhibited significantly better performances. The highest mass activity of Pt–Re bimetallic nanoparticles (127 μmol·g−1·s−1) was more than forty times that of the industrial catalyst CH3ReO3 (3 μmol·g−1·s−1). The catalytically active sites were associated with ReOx and could be tuned by adjusting the Pt ratio.
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Composition-tuned oxidation levels of Pt–Re bimetallic nanoparticles for the etherification of allylic alcohols. Nano Res. 2018, 11(11): 5902–5912

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