期刊
ACS CATALYSIS
卷 11, 期 9, 页码 4946-4954出版社
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.1c00455
关键词
single-atomic-site; high-loading; Ag catalyst; epoxidation of styrene; DFT calculations
资金
- Science and Technology Key Project of Guangdong Province of China [2020B010188002]
- National Natural Science Foundation of China [21871159]
- Fundamental Research Funds of Beijing University of Chemical Technology [buctrc202107]
- Youth Innovation Promotion Association of Chinese Academy of Sciences [2018017]
A single-atomic-site Ag catalyst supported by mesoporous graphitic carbon nitride was developed for styrene epoxidation, demonstrating outstanding catalytic performance with high conversion (96%) and selectivity (81%). The catalyst with Ag-1-C2N1 structure showed higher activity and selectivity compared to analogous catalysts, attributed to absorbed superoxide-like O-2 species and lower reaction barrier for styrene oxide generation.
Epoxidation is an efficient chemical process for manufacturing styrene oxide; however, it remains a huge challenge to develop cost-effective and environment-friendly catalysts for facilitating this process. Herein, we reported a single-atomic-site Ag catalyst supported by mesoporous graphitic carbon nitride (Ag-1/mpg-C3N4) with an Ag loading of up to 10.21 wt %, which is the highest loading among single-atomic-site Ag catalysts. The single-atomic-site Ag replaced the nitrogen of mpg-C3N4, possessing the Ag-1-C2N1 structure. The Ag-1/mpg-C3N4 catalyst with the Ag-1-C2N1 structure exhibited outstanding catalytic performance for styrene epoxidation with excellent conversion (96%) and high selectivity (81%). This performance was superior to that of the analogous Ag nanoparticle/mpg-C3N4 catalyst and previously reported catalysts. Density functional theory calculations showed that the absorbed superoxide-like O-2 species and the much lower reaction barrier to generating styrene oxide than the other products lead to high activity and selectivity, respectively.
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