Chem. J. Chinese Universities ›› 2023, Vol. 44 ›› Issue (10): 20230224.doi: 10.7503/cjcu20230224

• Physical Chemistry • Previous Articles     Next Articles

Iridium-based Catalyst Immobilized on Zeolite Subcrystals and Its Catalytic Transfer Hydrogenation Performance

WANG Shuqi, DU Ke, LI He, ZHANG Yahong()   

  1. Department of Chemistry,Fudan University,Shanghai 200433,China
  • Received:2023-05-05 Online:2023-10-10 Published:2023-06-28
  • Contact: ZHANG Yahong E-mail:zhangyh@fudan.edu.cn
  • Supported by:
    the National Key Research and Development Program of China(2018YFA0209402);the National Natural Science Foundation of China(22088101)

Abstract:

By immobilizing homogeneous catalysts, the advantages of high reaction activity of homogeneous catalysts and separability of heterogeneous catalysts can be preserved simultaneously. This work used zeolite subcrystals with ultra-small size and ultra-large specific surface area as the carrier to immobilize the homogeneous transfer hydrogenation catalyst[Cp*Ir(bpyO)]OH- by physical adsorption, achieving the preparation of an immobilized catalyst [Cp*Ir(bpyO)]OH-/Al-MFI-SC. The immobilization process and stability of the catalyst were preliminarily studied using UV-Vis to determine the amount of catalyst immobilized and demonstrate the stability of the immobilized catalyst. The characterization results of XRD, TEM, ICP-AES, Ar physical adsorption and desorption and XPS demonstrated that[Cp*Ir(bpyO)]OH- was uniformly immobilized on the surface of Al-MFI-SC. The strong interaction between the aluminum species in the zeolite subcrystals and the iridium complex was responsible for the stability of the immobilized catalyst. Finally, The catalyst was used for the catalytic transfer hydrogenation of cyclohexanone to cyclohexanol using glucose as the hydrogen donor and able to achieve a cyclohexanol yield of 75.4% under optimal reaction conditions. Compared with the homogeneous catalyst with the same weight percent of iridium, this immobilized catalyst showed better catalytic activity and good recycling performance. Meanwhile, the catalyst had a good reusability property. This work provides an idea for the preparation of immobilized catalysts for catalytic transfer hydrogenation reactions using zeolite subcrystal materials as the carrier.

Key words: Zeolite subcrystal, Catalytic transfer hydrogenation, Immobilization, Interaction

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