Abstract
A series of bimetallic Pd–Zn catalysts supported on the carbon material Sibunit was synthesized for selective hydrogenation of acetylene. XRD, XPS, XAFS and TEM data revealed that the structure and dispersion of bimetallic particles in Pd–Zn/Sibunit samples depend on the molar ratio Pd:Zn. The active component of the Pd–Zn(1:0.25)/Sibunit sample is a substitutional solid solution. In the catalysts with Pd:Zn ≤ 1, the interaction proceeds more completely with the transformation of FCC lattice of the solid solution into the tetragonal structure of intermetallic phase with the composition close to PdZn, whereas an excess of zinc forms the individual ZnO phase. It was found that an increase in the zinc content in Pd–Zn/Sibunit catalysts from Pd:Zn = 1:0 to 1:4 leads to dispergation of the deposited mono- and bimetallic particles from dav = 7.2 to 2.0 nm. The formation of the PdZn intermetallic compound with increasing the zinc content from Pd:Zn = 1:0 to 1:1 is accompanied by a gradual increase in selectivity to ethylene from 42% for Pd/Sibunit to 67% for Pd–Zn(1:1)/Sibunit (the reaction temperature is 95 °C), and also by a decrease in activity. The introduction of a zinc excess (Pd:Zn < 1), on the contrary, decreases the hydrogenation selectivity to ~ 62%, presumably owing to a high dispersion of bimetallic particles.
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Acknowledgements
This work was supported by the Ministry of Science and Higher Education of the Russian Federation within the Program of Fundamental Scientific Studies of State Academies of Sciences for years 2013–2020, direction V.46, project № V.46.2.5 (No. AAAA-A17-117021450096-8) and Haldor Topsoe. The research was performed using equipment of the Shared-Use Center "National Center for the Study of Catalysts" at the Boreskov Institute of Catalysis, the Scientific Research Center "Kurchatov Institute" and the Omsk Regional Center of Collective Usage, Siberian Branch of the Russian Academy of Sciences.
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The authors thank Y.V. Zubavichus for his assistance in obtaining the XAFS data, G.G. Savel’eva for determining the texture characteristics of the support and catalysts, R.R. Ismailov and A.V. Babenko for the analysis of the synthesized samples by AES-ICP, and P.G. Tsyrulnikov for valuable discussion of the results.
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Glyzdova, D.V., Afonasenko, T.N., Khramov, E.V. et al. Zinc Addition Influence on the Properties of Pd/Sibunit Catalyst in Selective Acetylene Hydrogenation. Top Catal 63, 139–151 (2020). https://doi.org/10.1007/s11244-019-01215-9
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DOI: https://doi.org/10.1007/s11244-019-01215-9