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The surface state and catalytic properties of Pt black after O2-H2 cycles

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Abstract

XPS and UPS of a Pt black catalyst after customary H2-O2 regeneration shows considerable amounts of residual C as well as surface OH/H2O species. Surface C could not be removed even by O2 at 800 K. Oxygenates are stable even after H2 treatment up to 750 K. Their chemical state has been tentatively identified by comparing XPS and UPS results. Catalytic transformations of n-hexane on Pt black treated analogously is reported and the effect of surface species on catalytic properties discussed. Possible consequences of the presence of stable surface OH/H2O species on H2-O2 titrations are mentioned.

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Authors and Affiliations

  1. Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, D-1000, Berlin 33, Germany

    Z. Paål, R. Schlögl & G. Ertl

Authors
  1. Z. Paål
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  2. R. Schlögl
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  3. G. Ertl
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On leave from Institute of Isotopes of the Hungarian Academy of Sciences Budapest P.O.B. 77, H-1525 Hungary.

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Paål, Z., Schlögl, R. & Ertl, G. The surface state and catalytic properties of Pt black after O2-H2 cycles. Catal Lett 12, 331–344 (1992). https://doi.org/10.1007/BF00765062

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  • DOI: https://doi.org/10.1007/BF00765062

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