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Study of the formation and stability of the Pd and Pt metallic nanoparticles on carbon support

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Abstract

Catalysts containing Pd and Pt on a Sibunit carbon support were studied by the temperature-programmed reduction, in situ X-ray photoelectron spectroscopy, and X-ray absorption spectroscopy (XAFS). The reduction of Pd and Pt species in samples 2%Pd/C and 2%Pt/C calcined in an air flow at 370°C was studied. Reduction of the 2%Pd/C sample begins at 50—60 °C and is completed at 250—300°C. Particles of various dispersion are formed during reduction. Long-distance peaks observed in the EXAFS spectra point to the presence of a fraction of relatively large crystallites. The average Pd—Pd coordination number (∼5) at 200 °C gives evidence that a number of very small Pd nanoparticles, oligomeric clusters, is present. Reduction at T > 200°C results in sintering of a small fraction of the Pd particles. Reduction of Pt in 2%Pt/C sample begins at 120—150 °C and is completed at 300—350°C. The sintering-resistant monodispersed Pt particles are formed under these conditions.

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Authors and Affiliations

  1. N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 47 Leninsky prosp., 119991, Moscow, Russian Federation

    A. Yu. Stakheev, O. P. Tkachenko, G. I. Kapustin, N. S. Telegina, G. N. Baeva, T. R. Brueva & L. M. Kustov

  2. Ruhr-University Bochum, D-44780, Bochum, Germany

    K. V. Klementiev & W. Grunert

  3. Hasylab at DESY, D-22607, Hamburg, Germany

    K. V. Klementiev

Authors
  1. A. Yu. Stakheev
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  2. O. P. Tkachenko
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  3. G. I. Kapustin
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  4. N. S. Telegina
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  5. G. N. Baeva
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  7. K. V. Klementiev
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  8. W. Grunert
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  9. L. M. Kustov
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Stakheev, A.Y., Tkachenko, O.P., Kapustin, G.I. et al. Study of the formation and stability of the Pd and Pt metallic nanoparticles on carbon support. Russian Chemical Bulletin 53, 528–537 (2004). https://doi.org/10.1023/B:RUCB.0000035632.12004.11

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  • DOI: https://doi.org/10.1023/B:RUCB.0000035632.12004.11

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