Hollow and Yolk-Shell Co-N-C@SiO2 Nanoreactors: Controllable Synthesis with High Selectivity and Activity for Nitroarene Hydrogenation

Xiaocheng Lan; Babar Ali; Yu Wang; Tiefeng Wang

doi:10.1021/acsami.9b19364

Hollow and Yolk-Shell Co-N-C@SiO₂ Nanoreactors: Controllable Synthesis with High Selectivity and Activity for Nitroarene Hydrogenation

Xiaocheng Lan, Babar Ali, Yu Wang, Tiefeng Wang^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

49 Scopus citations

Abstract

The use of hollow and yolk-shell nanocomposites is an effective route to enhance catalytic performance. A strategy that allows precise control of the nanocomposites was developed to synthesize novel hollow and yolk-shell SiO₂ nanoreactors of Co-N-C@SiO₂, which used ZIF-67 as the hard template and also as the source for active sites. A size dependence of the nanoreactor structure was observed. Large size of ZIF-67 gave yolk-shell Y-Co-N-C@SiO₂ while small size of crystals gave hollow H-Co-N-C@SiO₂. The hydrogenation reaction results showed that the Co-N-C@SiO₂ catalyst exhibited a high selectivity (>99%) to aniline and gave an activity (35.3 h^-1) ∼3.3 times higher than that of Co/SiO₂ (11.8 h^-1). The excellent performance was attributed to that Co nanoparticles were doped in the N-C framework where they formed Co-N_x species and that the HSN had a void structure that had a reduced diffusion limitation.

Original language	English
Pages (from-to)	3624-3630
Number of pages	7
Journal	ACS Applied Materials and Interfaces
Volume	12
Issue number	3
DOIs	https://doi.org/10.1021/acsami.9b19364
State	Published - 22 Jan 2020
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2019 American Chemical Society.

Keywords

controllable synthesis
hollow and yolk-shell structure
metal organic framework
nanoreactor
selective hydrogenation

ASJC Scopus subject areas

General Materials Science

Access to Document

10.1021/acsami.9b19364

Cite this

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title = "Hollow and Yolk-Shell Co-N-C@SiO2 Nanoreactors: Controllable Synthesis with High Selectivity and Activity for Nitroarene Hydrogenation",

abstract = "The use of hollow and yolk-shell nanocomposites is an effective route to enhance catalytic performance. A strategy that allows precise control of the nanocomposites was developed to synthesize novel hollow and yolk-shell SiO2 nanoreactors of Co-N-C@SiO2, which used ZIF-67 as the hard template and also as the source for active sites. A size dependence of the nanoreactor structure was observed. Large size of ZIF-67 gave yolk-shell Y-Co-N-C@SiO2 while small size of crystals gave hollow H-Co-N-C@SiO2. The hydrogenation reaction results showed that the Co-N-C@SiO2 catalyst exhibited a high selectivity (>99\%) to aniline and gave an activity (35.3 h-1) ∼3.3 times higher than that of Co/SiO2 (11.8 h-1). The excellent performance was attributed to that Co nanoparticles were doped in the N-C framework where they formed Co-Nx species and that the HSN had a void structure that had a reduced diffusion limitation.",

keywords = "controllable synthesis, hollow and yolk-shell structure, metal organic framework, nanoreactor, selective hydrogenation",

author = "Xiaocheng Lan and Babar Ali and Yu Wang and Tiefeng Wang",

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T2 - Controllable Synthesis with High Selectivity and Activity for Nitroarene Hydrogenation

AU - Lan, Xiaocheng

AU - Ali, Babar

AU - Wang, Yu

AU - Wang, Tiefeng

PY - 2020/1/22

Y1 - 2020/1/22

N2 - The use of hollow and yolk-shell nanocomposites is an effective route to enhance catalytic performance. A strategy that allows precise control of the nanocomposites was developed to synthesize novel hollow and yolk-shell SiO2 nanoreactors of Co-N-C@SiO2, which used ZIF-67 as the hard template and also as the source for active sites. A size dependence of the nanoreactor structure was observed. Large size of ZIF-67 gave yolk-shell Y-Co-N-C@SiO2 while small size of crystals gave hollow H-Co-N-C@SiO2. The hydrogenation reaction results showed that the Co-N-C@SiO2 catalyst exhibited a high selectivity (>99%) to aniline and gave an activity (35.3 h-1) ∼3.3 times higher than that of Co/SiO2 (11.8 h-1). The excellent performance was attributed to that Co nanoparticles were doped in the N-C framework where they formed Co-Nx species and that the HSN had a void structure that had a reduced diffusion limitation.

AB - The use of hollow and yolk-shell nanocomposites is an effective route to enhance catalytic performance. A strategy that allows precise control of the nanocomposites was developed to synthesize novel hollow and yolk-shell SiO2 nanoreactors of Co-N-C@SiO2, which used ZIF-67 as the hard template and also as the source for active sites. A size dependence of the nanoreactor structure was observed. Large size of ZIF-67 gave yolk-shell Y-Co-N-C@SiO2 while small size of crystals gave hollow H-Co-N-C@SiO2. The hydrogenation reaction results showed that the Co-N-C@SiO2 catalyst exhibited a high selectivity (>99%) to aniline and gave an activity (35.3 h-1) ∼3.3 times higher than that of Co/SiO2 (11.8 h-1). The excellent performance was attributed to that Co nanoparticles were doped in the N-C framework where they formed Co-Nx species and that the HSN had a void structure that had a reduced diffusion limitation.

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KW - nanoreactor

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