Chem. J. Chinese Universities ›› 2023, Vol. 44 ›› Issue (12): 20230282.doi: 10.7503/cjcu20230282

• Article: Inorganic Chemistry • Previous Articles    

Application of Covalent Organic Framework-Polyoxometalates Composites in Heterogeneous Catalytic Epoxidation of Olefins

KONG Xiangyu1,2, LIAO Li3, LU Canzhong1,2(), FANG Qianrong3()   

  1. 1.Fujian Institute of Research on the Structure of Matter,Chinese Academy of Sciences,Fuzhou 350025,China
    2.School of Physical Science and Technology,Shanghai Tech University,Shanghai 201210,China
    3.State Key Laboratory of Inorganic Synthesis and Preparative Chemistry,Jilin University,Changchun 130012,China
  • Received:2023-06-14 Online:2023-12-10 Published:2023-09-14
  • Contact: FANG Qianrong E-mail:czlu@fjirsm.ac.cn;qrfang@jlu.edu.cn
  • Supported by:
    the National Key Research and Development Program of China(2022YFB3704900);the National Natural Science Foundation of China(52073286)

Abstract:

Covalent organic frameworks are crystalline porous materials with great application potential in heterogeneous catalysis. We synthesized a new functional covalent organic framework, COF-FL-2, using derivatives of electron-deficient naphthalene diimide(NDI) as monomers. COF-FL-2 has a large pore size and good adsorption performance. The NDI structure on the skeleton can form a stable functional composite with polyoxometalates through π-anion interaction. A novel hybrid heteropolyacid complex, PTA@COF-FL-2, was prepared by loading phosphotungstic acid(PTA) on COF-FL-2. Remarkably, PTA@COF-FL-2 shows high catalytic activity for the epoxidation of olefins with t-BuOOH as the oxidant, and can epoxidate cyclooctene and 1-octene into the corresponding epoxides under mild conditions. PTA@COF-FL-2 can be used for a long time under reaction conditions, and there is no PTA leaching phenomenon when used. In addition, PTA@COF-FL-2 is very convenient to recycle and can be recycled many times.

Key words: Covalent organic framework, Polyoxometalate, Heterogeneous catalysis, Loading material, Epoxidation of alkene

CLC Number: 

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