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Cobalt single atoms supported on monolithic carbon with a hollow-on-hollow architecture for efficient transfer hydrogenations

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Abstract

Single-atom catalysts (SACs) have received considerable attention in hydrogenation of nitroaromatic compounds to aromatic amines. In order to enhance the exposure of single atoms and overcome the mass transfer limitation, construction of hierarchical porous supports for single atoms is highly desirable. Herein, we report a straightforward method to synthesize Co single-atoms supported on a hollow-on-hollow structured carbon monolith (Co1/HOHC-M) by pyrolysis of α-cellulose monolith loaded with PS-core@ZnCo-zeolite imidazolate frameworks-shell nanospheres (PS@Zn-ZIFs/α-cellulose). The hollow-on-hollow structure consists of a large hollow void with a diameter of ~ 290 nm (derived from the decomposition of polystyrene (PS) nanospheres) and a thin shell with hollow spherical pores with a diameter of ~ 10 nm (derived from the evaporation of ZnO nanoparticles that are in-situ formed during pyrolysis in the presence of CO2 from α-cellulose decomposition). Benefitting from the hierarchically porous architecture, the Co1/HOHC-M exhibits excellent catalytic performance (reaction rate of 421.6 mmol·gCo−1·h−1) in the transfer hydrogenation of nitrobenzene to aniline, outperforming the powdered sample of Co1/HCS without the hollow spherical mesopores (reaction rate of 353.8 mmol·gCo−1·h−1). It is expected that this strategy could be well extended in heterogeneous catalysis, given the wide applications of porous carbon-supported single-atom catalysts.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (No. 52100169) and the Natural Science Foundation of Shandong Province (Nos. ZR2020QB196, ZR2022ZD30, and ZR2020QB053).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Ocean University of China, Qingdao, 266100, China

    Xiangyi Gong, Ge Su & Minghua Huang

  2. Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, 266101, China

    Xiangyi Gong, De-Chang Li, Qian Zhang, Wenquan Wang, Zhengbin Tian & Guang-Hui Wang

  3. University of Chinese Academy of Sciences, Beijing, 100049, China

    Qian Zhang, Wenquan Wang & Guang-Hui Wang

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  1. Xiangyi Gong
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Correspondence to De-Chang Li, Minghua Huang or Guang-Hui Wang.

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Cobalt single atoms supported on monolithic carbon with a hollow-on-hollow architecture for efficient transfer hydrogenations

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Gong, X., Li, DC., Zhang, Q. et al. Cobalt single atoms supported on monolithic carbon with a hollow-on-hollow architecture for efficient transfer hydrogenations. Nano Res. 16, 11358–11365 (2023). https://doi.org/10.1007/s12274-023-5813-9

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