Selective Oxidation From Toluene to Benzaldehyde via 4f-Orbital Involvement
Shuai Qin1, Wenlong Yang1, Jiaolong Meng2
1School of Chemistry and Chemical Engineering, Hainan University, Haikou, China.
Researchers developed Sm-doped Bi2WO6 nanosheets for selective toluene oxidation. This advanced catalyst achieves high conversion to benzaldehyde using f-orbital catalysis and interfacial synergy.
Area of Science:
- Materials Science
- Catalysis
- Nanotechnology
Background:
- Selective oxidation of benzylic C-H bonds remains a significant challenge.
- Developing efficient catalysts for toluene to benzaldehyde conversion is crucial.
Purpose of the Study:
- To construct Sm3+ doped Bi2WO6 (Sm-BWO) nanosheets with dual-active sites.
- To investigate the mechanism of selective benzylic C-H oxidation.
- To leverage f-orbital catalysis for enhanced oxygen activation.
Main Methods:
- In situ lattice substitution to synthesize Sm-BWO nanosheets.
- Mechanistic investigations using advanced characterization techniques.
- Density Functional Theory (DFT) calculations to understand electronic structure and interactions.
Main Results:
- Achieved a high toluene conversion rate of 8550 µmol·g-1·h-1.
- Demonstrated high selectivity toward benzaldehyde (>86%).
- Identified Sm-doping induced oxygen vacancies and Bi-O frustrated Lewis pairs (FLPs) facilitating C-H dehydrogenation.
Conclusions:
- Sm-BWO nanosheets exhibit interfacial synergy for efficient selective oxidation.
- f-orbital catalysis via localized Sm enables effective O2 activation and oxygenation.
- This strategy offers a generalizable approach for C-H functionalization using light rare earths.
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