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Green Oxidation of Cyclohexanone to Adipic Acid over Phosphotungstic Acid Encapsulated in UiO-66

  • Jian FengEmail author
  • Min Li
  • Xiaojing Meng
Article
  • 22 Downloads

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.

Graphical Abstract

Keywords

Phosphotungstic acid Metal–organic frameworks Cyclohexanone Adipic acid 

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

Notes

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).

Compliance with Ethical Standards

Conflict of interest

The authors declare no conflict of interest.

Supplementary material

10562_2019_2764_MOESM1_ESM.docx (34 kb)
Supplementary material 1 (DOCX 34 kb)

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© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.School of Chemistry and Chemical EngineeringChongqing University of Science and TechnologyChongqingChina

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