Chinese Journal of Catalysis ›› 2023, Vol. 48: 258-266.DOI: 10.1016/S1872-2067(23)64400-6

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Magnetic core-shell composites accessed by coordination assembly boost catalytic CO2 valorization

Jinpeng Lia, Jie Chena, Qingshu Zhenga, Bo Tua,*(), Tao Tua,b,c,*()   

  1. aShanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Department of Chemistry, Fudan University, Shanghai 200438, China
    bState Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, China
    cGreen Catalysis Center and College of Chemistry, Zhengzhou University, Zhengzhou 450001, Henan, China
  • Received:2023-01-12 Accepted:2023-01-27 Online:2023-05-18 Published:2023-04-20
  • Contact: * E-mail: botu@fudan.edu.cn (B. Tu),taotu@fudan.edu.cn (T. Tu)
  • Supported by:
    National Natural Science Foundation of China(21871059);National Natural Science Foundation of China(21861132002)

Abstract:

Magnetic core-shell composites are readily accessed by encapsulating Fe3O4 nanoparticles with NHC-M (M = Ir, Pd) coordination assemblies, which function as solid molecular catalysts and exhibit enhanced catalytic activity compared to the corresponding bis-NHC-Ir molecules in both hydrogenation and dehydrogenation reactions related to CO2. A record turnover number (TON: 1.69 × 106) was achieved in the hydrogenation of CO2 to formic acid. In addition, robust solid catalysts can be magnetically recovered and reused for more than 11 runs without obvious loss in activity and selectivity for the dehydrogenation of ammonium formate, even at 10-6 mmol level catalyst loadings.

Key words: CO2 valorization, Coordination assembly, Morphology tuning, N-heterocyclic carbene complex, Magnetic composite