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Boosting Creation of Oxygen Vacancies in Co-Co3O4 Homogeneous Hybrids for Aerobic Oxidation of Cyclohexane

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Abstract

Co-Co3O4 hybrids were synthesized by pyrolysis of Co2+/ZIF-67 precursors and employed into cyclohexane aerobic oxidation. Homogeneity degree of Co3O4 distribution in Co was affected by the cobalt loading. The homogeneity of Co-Co3O4 hybrids brought about the low crystallinity and declined reducibility of Co3O4, creation of abundant oxygen vacancies due to the existence of Co-Co3O4 interaction. As the cobalt loading increased the amount of surface oxygen vacancies presented the volcano shape and maximized at 65.3 wt%. The catalytic performance was positively correlated with surface oxygen vacancies and the highest conversion of 16.3% with 96.5% KA oil selectivity was obtained over 65Co-Co3O4/CN catalyst. Kinetic study revealed that the presence of abundant oxygen vacancies can effectively decrease the activation energy of cyclohexane oxidation via the promoted activation of O2. Additionally, water formed during cyclohexane oxidation was the main reason for the catalyst deactivation because of the preferred adsorption on the active sites.

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Acknowledgements

The authors are grateful to the financial support from Jiangsu Province Natural Science Foundation of China (BK20180935) and Yangzhou City Lvyangjinfeng Project of China.

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Authors and Affiliations

  1. School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, Jiangsu, 225002, P.R. China

    Enxian Yuan, Meixia Zhou, Mingqing Gu & Panming Jian

  2. Natural Gas Purification Plant, PetroChina Southwest Oil & Gasfield Company, Chongqing, 400000, P.R. China

    Lin Xia

  3. School of Chemical Engineering, Huaqiao University, Xiamen, Fujian, 361021, P.R. China

    Jingran Xiao

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  1. Enxian Yuan
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  2. Meixia Zhou
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  3. Mingqing Gu
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Correspondence to Enxian Yuan.

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Yuan, E., Zhou, M., Gu, M. et al. Boosting Creation of Oxygen Vacancies in Co-Co3O4 Homogeneous Hybrids for Aerobic Oxidation of Cyclohexane. Catal Lett 152, 282–298 (2022). https://doi.org/10.1007/s10562-021-03638-0

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