Preparation of Pd-ZIF-8 single-atom catalyst with supercritical CO2 deposition method

In recent years, single-atom catalysts (SAC) have emerged as a new frontier in the field of heterogeneous catalysis owing to their unique properties and minimized metal dosage. Herein, the Pd-ZIF-8 single-atom catalyst was successfully fabricated using ZIF-8 as support, and Pd(hfac)2 as the precurso...

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Veröffentlicht in:Microporous and mesoporous materials 2022-12, Vol.346, p.112287, Article 112287
Hauptverfasser: Qi, Jian-Lei, Zhou, Dan, Xu, Qin-Qin, Yin, Jian-Zhong, Yu, Kun-Peng, Sun, Hai-Xin
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Sprache:eng
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Zusammenfassung:In recent years, single-atom catalysts (SAC) have emerged as a new frontier in the field of heterogeneous catalysis owing to their unique properties and minimized metal dosage. Herein, the Pd-ZIF-8 single-atom catalyst was successfully fabricated using ZIF-8 as support, and Pd(hfac)2 as the precursor using the supercritical CO2 deposition method. Aberration-corrected high-angle annular dark-field scanning transmission electron microscopy (AC-HAADF-STEM) images confirmed the formation of uniformly dispersed Pd atoms. Supercritical CO2 has the advantage of zero-surface tension and high diffusibility, it can carry the molecules of Pd precursor into the micropores of ZIF-8. The dissolution and diffusion of precursor were observed by a visual view cell and the mechanism of the preparation was analyzed. Finally, semi-hydrogenation of phenylacetylene to styrene was performed to evaluate the catalytic activity of the prepared Pd-ZIF-8 catalyst. The conversion rate of 80.7% and selectivity of 92.2% were obtained at 70 °C and 4 h in the semi-hydrogenation of phenylacetylene. [Display omitted] •Pd-ZIF-8 SAC was prepared by supercritical CO2 deposition for the first time.•A new path for preparing single-atom catalysts using pure ZIF-8 support was opened.•No high-temperature treatment, acids, or corrosive solvents were required during the process.•AC-HAADF-STEM directly confirmed the uniform dispersion of Pd atoms.•Phenylacetylene was hydrogenated with the conversion of 80.7% and the selectivity of styrene was 92.2%.
ISSN:1387-1811
1873-3093
DOI:10.1016/j.micromeso.2022.112287