Abstract
A very stable catalyst, phosphotungstic acid (PTA) encapsulated in metal–organic framework UiO-66, was prepared by a simple one-pot solvothermal method. Characterization results show that UiO-66 is quite stable in the catalyst preparation process, and PTA is encapsulated in the cavities of UiO-66 with good dispersity. The as-synthesized composite material exhibited good catalytic activity and excellent reusability for the green oxidation of cyclohexanone to adipic acid (AA). Under mild reaction conditions, the isolated yield of AA was as high as 80.3% without the introduction of any organic solvent or phase transfer agent. The excellent immobilization effect of UiO-66 for PTA is mainly because UiO-66 has a well matched window size to confine PTA molecule in its nanocages.
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Abbreviations
- AA:
-
Adipic acid
- DMF:
-
N,N-dimethylformamide
- FT-IR:
-
Fourier transform infrared spectroscopy
- ICP-AES:
-
Inductively coupled plasma-atomic emission spectroscopy
- MOFs:
-
Metal–organic frameworks
- PTA:
-
Phosphotungstic acid
- SEM:
-
Scanning electron microscope
- TEM:
-
Transmission electron microscopy
- TGA:
-
Thermogravimetric analysis
- TOF:
-
Turnover frequency
- XRD:
-
X-ray diffraction
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (21302237, 51708075) and the Scientific and Technological Research Program of Chongqing Municipal Education Commission (KJ1713335, KJQN201801527).
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Feng, J., Li, M. & Meng, X. Green Oxidation of Cyclohexanone to Adipic Acid over Phosphotungstic Acid Encapsulated in UiO-66. Catal Lett 149, 1504–1512 (2019). https://doi.org/10.1007/s10562-019-02764-0
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DOI: https://doi.org/10.1007/s10562-019-02764-0