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Formation of small rhodium metal particles on the surface of a carbon support

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Abstract

A rhodium catalyst supported on a Sibunit graphitized carbon carrier was studied by in situ XAFS spectroscopy. A comparative study of the reduction of rhodium was performed for the following two samples: Rh/C(120) dried at 120°C and Rh/C(350) calcined at 350°C. EXAFS data showed an absence of carbon atoms within the nearest environment of rhodium atoms in the Rh/C(120) uncalcined sample, which implies the absence of direct interaction between rhodium and the carbon support. In the course of the reduction of this sample (200°C), coarse particles with small metal cores were initially formed. These metal particles rapidly agglomerated upon the complete reduction of rhodium (350°C). These reduction of the Rh/C(350) calcined sample at 100–500°C resulted in the formation of small metal particles early in the reduction (100°C). The high dispersity of these particles was retained as the temperature of treatment in hydrogen was increased to 500°C due to metal-support interaction. The conversion of benzene into cyclohexane on the Rh/C(350) catalyst containing small rhodium particles was much higher at the same temperature of hydrogenation.

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Authors and Affiliations

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

    A. Yu. Stakheev, O. P. Tkachenko, G. O. Bragina, I. S. Mashkovskii & L. M. Kustov

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

    K. V. Klement’ev & W. Grünert

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

    K. V. Klement’ev

Authors
  1. A. Yu. Stakheev
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  2. O. P. Tkachenko
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  3. K. V. Klement’ev
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  4. W. Grünert
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  5. G. O. Bragina
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  6. I. S. Mashkovskii
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  7. L. M. Kustov
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Translated from Kinetika i Kataliz, Vol. 46, No. 1, 2005, pp. 122–130.

Original Russian Text Copyright © 2005 by Stakheev, Tkachenko, Klement’ev, Grünert, Bragina, Mashkovskii, Kustov.

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Stakheev, A.Y., Tkachenko, O.P., Klement’ev, K.V. et al. Formation of small rhodium metal particles on the surface of a carbon support. Kinet Catal 46, 114–122 (2005). https://doi.org/10.1007/PL00021994

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  • DOI: https://doi.org/10.1007/PL00021994

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