Chemical Research in Chinese Universities ›› 2023, Vol. 39 ›› Issue (4): 660-665.doi: 10.1007/s40242-023-3092-3

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Fe-substituted Polyoxometalate-based Spherical Assemblies as Catalysts for Olefin Epoxidation

HUANG Xinjie1,2, WANG Ziru2, WANG Tian2, WANG Wei1,2, HE Peilei2,3   

  1. 1. School of Materials Science and Chemical Engineering, Ningbo University, Ningbo 315211, P.R. China;
    2. Institute of New Energy Technology, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, P.R. China;
    3. University of Chinese Academy of Sciences, Beijing 100049, P.R. China
  • Received:2023-04-10 Online:2023-08-01 Published:2023-07-18
  • Contact: HE Peilei E-mail:hepeilei@nimte.ac.cn
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (No.22101289), the Hundred Talents Programs in the Chinese Academy of Science, and the Ningbo Yongjiang Tablent Introduction Programme, China(No. 2021A-111-G).

Abstract: Fe-substituted polyoxometalate(Na15[(P2W15O56)2Fe3])(Fe-POM)- based composite (C19H42N)15[(P2W15O56)2Fe3](CTAB-Fe-POM) was successfully synthesized through an ion-exchanged method. Then, it was self-assembly in a mixed solvent to form surfactant encapsulated complex nanosphere(SECN). The as-prepared SECN was employed as the catalyst for the epoxidation of olefins with H2O2. Compared with (C19H42N)6[α-P2W18O62](CTAB-P2W18), SECN shows a higher activity in the epoxidation of cis-cyclooctene with a high yield(97.3%). The extraordinary performance could be attributed to the amphiphilic module of cetyltrimethylammonium bromide(CTAB), which improves the dispersion of the catalyst in CH3CN and accelerates the catalytic reaction. And Fe atom can rapidly activate H2O2, forming the active intermediate Fe-OOH to realize the transfer of active “O”. Furthermore, the catalyst could be reused five times without significant loss of activity.

Key words: Polyoxometalate, Self-assembly, Epoxidation, Nanosphere, Mechanism