4.4 Article

Observation of Cobalt Species Evolution in Mesoporous Carbon by In-Situ STEM-HAADF Imaging and Related Hydrogenation Process

Journal

CHEMISTRYSELECT
Volume 7, Issue 9, Pages -

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/slct.202104371

Keywords

carbon materials; hydrogenation; mesoporous; supported catalysis

Funding

  1. National Key RD Program Plan [2020YFB0606400]
  2. National Natural Science Foundation of China [21776174, 22178219]
  3. Inner Mongolia Key RD Program Plan [2021ZD0042]
  4. Shanghai Rising-Star Program [20QA1405200]
  5. Shanghai Jiao Tong University Scientific and Technological Innovation Funds [2019QYB06]

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Metal decorated-mesoporous carbons (MMCs) combine the advantages of mesoporous materials and metal species. A cobalt@mesoporous carbon (Co@MC) catalyst was successfully synthesized, and the effect of different calcination temperatures on cobalt species was studied. The Co@MC catalyst showed high phenol conversion and cyclohexanone selectivity in the phenol hydrogenation reaction.
Metal decorated-mesoporous carbons (MMCs) has attractive features from both mesoporous materials (large pore size, high pore volume) and metal species (reactive surface). Cobalt@mesoporous carbon (Co@MC) catalyst was successfully manufactured by mechanochemical synthesis method for hydrogenation of phenol to prepare cyclohexanone. Unlike traditional hard-templating and soft-templating methods, the essence of this strategy lies in the combination of carbonization and ligand-protected metal reduction. By using Fourier transform-infrared spectroscopy, X-ray diffraction and N-2 adsorption-desorption, Co@MC catalyst was well studied. In particular, the effect of calcination temperature in terms of growth and aggregation of cobalt species was detailly explored by in-situ scanning transmission electron microscopy-high angle angular dark field. A series of mesoporous carbons with cobalt species readily tuned from clusters to nanoparticles were measured in phenol hydrogenation (Conv. Phenol: >99 %, Sel. Cyclohexanone: >99 %).

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