@article{Wang2018, 
author = {Yuhao Wang and Lindong Li and Ke Wu and Rui Si and Lingdong Sun and Chunhua Yan},
title = {Composition-tuned oxidation levels of Pt–Re bimetallic nanoparticles for the etherification of allylic alcohols},
year = {2018},
journal = {Nano Research},
volume = {11},
number = {11},
pages = {5902-5912},
keywords = {composition, nanocatalysis, Re, Pt, oxidation level, allylic alcohol},
url = {https://www.sciopen.com/article/10.1007/s12274-018-2102-0},
doi = {10.1007/s12274-018-2102-0},
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.}
}