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Effect of the basic surface sites of carbons on the degree of dispersion of platinum catalysts prepared by H2PtCl6 adsorption

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Abstract

In the synthesis of Pt/C catalysts via H2PtCl6 adsorption onto a carbon support, NH4Cl can be formed catalytically during the reduction of the precursor with H2 at 250°C. This compound favors the sintering of metal particles. This effect is likely due to the weakening of metal-support bonding because of NH4Cl adsorption on the Pt surface. The sources of nitrogen and chlorine atoms are basic surface sites of the support, which contain nitrogen atoms in their structure and adsorb Cl− ions from the precursor solution. This effect is typical of active carbons, whose surface contains chemically bound nitrogen as amino groups, and weakens as the Pt/N atomic ratio in the supported catalyst precursors is increased.

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Authors and Affiliations

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

    A. N. Kholodovich, P. A. Simonov, R. I. Kvon, V. I. Zaikovskii, Yu. A. Chesalov & A. V. Romanenko

  2. Novosibirsk State University, Novosibirsk, 630090, Russia

    A. V. Bukhtiyarov

Authors
  1. A. N. Kholodovich
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  2. P. A. Simonov
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  3. R. I. Kvon
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  4. A. V. Bukhtiyarov
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  5. V. I. Zaikovskii
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  6. Yu. A. Chesalov
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  7. A. V. Romanenko
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Correspondence to P. A. Simonov.

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Original Russian Text © A.N. Kholodovich, P.A. Simonov, R.I. Kvon, A.V. Bukhtiyarov, V.I. Zaikovskii, Yu.A. Chesalov, A.V. Romanenko, 2008, published in Kinetika i Kataliz, 2008, Vol. 49, No. 6, pp. 936–943.

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Kholodovich, A.N., Simonov, P.A., Kvon, R.I. et al. Effect of the basic surface sites of carbons on the degree of dispersion of platinum catalysts prepared by H2PtCl6 adsorption. Kinet Catal 49, 886–892 (2008). https://doi.org/10.1134/S002315840806013X

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  • DOI: https://doi.org/10.1134/S002315840806013X

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