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Aerobic oxidation of C-H bond under ambient conditions using highly dispersed Co over highly porous N-doped carbon

Abstract

Highly dispersed Co sites in highly porous N-doped carbon (Co-NC) were synthesized by high-temperature pyrolysis of Zn/Co bimetallic zeolitic imidazolate framework-8 (CoxZn100-x-ZIF). Wide characterizations indicated that the pyrolysis atmosphere and temperature play crucial roles in the metal dispersion and pore structure of the resulting materials. A hydrogen treatment at elevated temperatures is found to favour the Zn volatilization and restriction the pore-shrink of the ZIF precursor, thus yielding efficient catalysts with highly dispersed Co, high surface area (1090 m²/g) and pore volume (0.89 cm³/g). When using as a catalyst for aerobic oxidation of ethylbenzene (EB), Co1Zn99-ZIF-800-H2 contributes to 98.9 % EB conversion and 93.1 % ketone selectivity at mild conditions (60 oC, 1 atm O2), which is 41.3 times more active in comparison to ZIF-67-derived Co catalyst. Co-NC is stable and could be reused for four times without obvious deactivation. This catalyst displays good chemoselectivity to the corresponding ketones when using a broad scope of hydrocarbon compounds.

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Supplementary files

Publication details

The article was received on 21 Nov 2018, accepted on 11 Feb 2019 and first published on 11 Feb 2019


Article type: Paper
DOI: 10.1039/C8GC03653E
Citation: Green Chem., 2019, Accepted Manuscript

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    Aerobic oxidation of C-H bond under ambient conditions using highly dispersed Co over highly porous N-doped carbon

    R. Nie, J. Chen, M. Chen, Z. Qi, T. W. Goh, T. Ma, L. Zhou, Y. Pei and W. Huang, Green Chem., 2019, Accepted Manuscript , DOI: 10.1039/C8GC03653E

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