期刊
CHEMICAL ENGINEERING JOURNAL
卷 429, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.132149
关键词
Heterogeneous catalysis; Palladium single atom catalyst; Photochemical reduction; Alkene epoxidation; Catalytic activity
资金
- China Postdoctoral Science Foundation [2019M661247, 2020T130091]
- Postdoctoral Science Foundation of Heilongjiang Province [LBH-Z19047]
- Program for Overseas Talents Introduction of Northeast Petroleum University [15041260303]
- Scientific Research Foundation for Returned Scholars of Heilongjiang Province of China [719900091]
- National Natural Science Foundation of China [51902052, 51420105003, 11525415]
This study demonstrates the successful construction of atomically dispersed palladium atoms supported on defect-containing boehmite nanoleaf through a photoinduction method, showing excellent catalytic efficiency and recyclability in trans-stilbene epoxidation. The high catalytic activity is revealed to originate from under-coordinated single palladium atoms in a specific environment.
Exploring the interaction between metal and support is of great importance in enhancing the catalytic performance and deepening the mechanistic understanding of single atom catalysis. Here we describe a photoinduction method to construct atomically dispersed palladium atoms supported over defect-containing boehmite (gamma-AlOOH) nanoleaf with a palladium loading of 0.32 wt%. The existence of singly dispersed palladium atoms is confirmed by spherical aberration correction electron microscopy, extended X-ray absorption fine structure measurement, and CO-absorbed diffuse reflectance infrared Fourier transform spectroscopy. This catalyst shows excellent catalytic efficiency in trans-stilbene epoxidation to yield trans-stilbene oxide (TOF: 416 h-1; conversion: 84 %; selectivity: 99 %), along with excellent recyclability and scalability. In addition, various aromatic olefins were successfully transformed into the corresponding epoxides with high selectivity and excellent yield. DFT study further reveals that the high catalytic activity originates from under-coordinated single palladium atoms in the defect-containing gamma-AlOOH in a unique coordination environment. This lays the foundation for the facile creation of single atom catalysts and sheds light on the possibility for scale-up production.
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