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The Electrostatic Field Effect on Catalytic Properties of Platinum Clusters Confined in Zeolite for Hydrogenation

Abstract

The electrostatic field of dielectric cavity is powerful to modulate the confined metal clusters in many aspects. Here we report the catalytic properties of Ptn clusters confined in X-zeolite cages are strongly tuned by altering the zeolitic field, which is achieved by using different cations (Na+, Cs+, Ca2+ or La3+) to balance the negative framework of the zeolite. Compared with Ptn@LaX, for example, the Ptn@CsX shows surprisingly ~5500% enhanced TOF value for phenol hydrogenation to cyclohexanol. The electrostatic field modulation leads to gradual changes of electronic properties such as Fermi levels/d-band centers of the Ptn clusters, as revealed by DFT calculations and experimental characterizations. The decreases in Fermi levels of the Ptn clusters benefit the hydrogenations of “-C≡CH” groups (phenylacetylene and acetylene) and “-NO2” groups (nitrobenzene, o-nitroanisole and o-chloronitrobenzene) but are detrimental for “aromatic ring” hydrogenation (phenol). The findings are important for design of high performance catalysts.

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Publication details

The article was received on 06 Sep 2018, accepted on 19 Oct 2018 and first published on 22 Oct 2018


Article type: Paper
DOI: 10.1039/C8CY01867G
Citation: Catal. Sci. Technol., 2018, Accepted Manuscript
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    The Electrostatic Field Effect on Catalytic Properties of Platinum Clusters Confined in Zeolite for Hydrogenation

    W. Ding, Z. Zhang, Y. Li, J. Gu, L. Ding, N. Xue, L. Peng, X. Guo, Y. Zhu and J. Ma, Catal. Sci. Technol., 2018, Accepted Manuscript , DOI: 10.1039/C8CY01867G

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