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Formation of Isolated Single-Atom Pd1 Sites on the Surface of Pd–Ag/Al2O3 Bimetallic Catalysts

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Abstract

The structure of Pd–Ag/Al2O3 samples with different Ag/Pd ratios has been studied by a complex of physicochemical methods (H2-TPR, XRD, H2-TPD, TEM). Catalysts have been synthesized by supporting an active component on α-Al2O3 and γ-Al2O3. X-ray diffraction analysis has revealed the formation of a Pd–Ag substitutional solid solution with a face-centered cubic crystal lattice owing to alloying of the Pd and Ag components. An increase in the Ag content in the composition of bimetallic nanoparticles hinders the formation of palladium hydride (PdHx), which is completely suppressed at a ratio of Ag/Pd > 0.5. Infrared spectroscopy of adsorbed CO has revealed the formation of single-atom Pd1 sites on the surface of supported Pd–Ag bimetallic nanoparticles isolated from each other by silver atoms. Analysis of the structural stability of isolated Pd1 sites has shown that, under conditions of CO adsorption at 150°C, the stability of the sites can be provided by an increase in the Ag/Pd ratio to ≥2.

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ACKNOWLEDGMENTS

The authors thank G.I. Kapustin for analyzing the samples by the H2-TPR. The electron microscopy studies of the samples were conducted by employees of the Department of Structural Studies of Zelinsky Institute of Organic Chemistry of the Russian Academy of Sciences.

Funding

This work was supported by the Russian Science Foundation (project no. 19-13-00285). The synthesis procedure for bimetallic Pd–Ag catalysts is based on the results obtained in studies supported by a grant of the Russian Science Foundation (no. 16-13-10530).

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Authors and Affiliations

  1. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 119991, Moscow, Russia

    A. V. Rassolov, G. O. Bragina, G. N. Baeva, N. S. Smirnova, A. V. Kazakov, I. S. Mashkovsky & A. Yu. Stakheev

  2. Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences, 630090, Novosibirsk, Russia

    A. V. Bukhtiyarov & Ya. V. Zubavichus

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  1. A. V. Rassolov
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  2. G. O. Bragina
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  3. G. N. Baeva
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  4. N. S. Smirnova
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  5. A. V. Kazakov
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  6. I. S. Mashkovsky
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  7. A. V. Bukhtiyarov
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  8. Ya. V. Zubavichus
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  9. A. Yu. Stakheev
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Correspondence to A. Yu. Stakheev.

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Translated by M. Timoshinina

Abbreviations: H2-TPR, temperature-programmed reduction with hydrogen; XRD, X-ray diffraction analysis; H2-TPD, temperature-programmed desorption of hydrogen; TEM, transmission electron microscopy; ICP–AES, inductively coupled plasma atomic emission spectroscopy; fcc, face-centered cubic crystal lattice

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Rassolov, A.V., Bragina, G.O., Baeva, G.N. et al. Formation of Isolated Single-Atom Pd1 Sites on the Surface of Pd–Ag/Al2O3 Bimetallic Catalysts. Kinet Catal 61, 758–767 (2020). https://doi.org/10.1134/S0023158420050080

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