期刊
JOURNAL OF CATALYSIS
卷 394, 期 -, 页码 113-120出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2020.12.027
关键词
Heterogeneous catalysis; Gold nanoparticles as catalysts; Ligand effect; Graphene as support; Hybrid materials
资金
- MICIU/AEI/FEDER [RTI2018-098237-B-C21, RTI2018-098237-BC22, PID2019-105881RB-I00]
- Universitat Jaume I [UJI-B201823]
- MINECO [FPU15/03011]
The ligand has a significant impact on the stability of gold nanoparticles on graphene, with NHC ligands containing pyrenyl handle showing superior catalytic activity and ability to be recycled at least ten times while maintaining particle size, demonstrating high stability.
Gold nanoparticles (Au NPs) functionalized with N-heterocyclic carbene (NHC) ligands immobilized onto graphene are obtained via spontaneous decomposition of well-defined gold-NHC complexes by reduced graphene oxide (rGO) without reducing agents. NHC ligands are responsible for the formation of air stable, crystalline and small (3.0-4-0 nm) Au NPs homogeneously distributed on the surface of graphene. The catalytic properties of three Au NPs functionalized with different ligands were tested in two benchmark reactions (hydration of alkynes and intramolecular hydroamination of alkynes). The results reveal a pronounced ligand effect on the stability of Au NPs on graphene, by acting as a bridge between them. The Au NPs functionalized with a NHC ligand lacking a polyaromatic group or having a naphthyl tag displayed limited stability and fast deactivation in the first run. On the contrary, the Au NPs functionalized with a NHC ligand containing a pyrenyl handle showed superior catalytic activity and can be recycled at least ten times. The particle size of the Au NPs is preserved after the recycling process indicating a high stability. These results illustrate the use of purposely designed ligands having affinity for both Au NPs and graphene to increase the stability of the hybrid catalyst. (c) 2020 Elsevier Inc. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据