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Catalytic CO Oxidation on Individual (110) Domains of a Polycrystalline Pt Foil: Local Reaction Kinetics by PEEM

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Abstract

The reaction kinetics of catalytic CO oxidation on individual grains of a polycrystalline Pt foil has been studied simultaneously by photoemission electron microscopy (PEEM) and mass spectroscopy (MS), in the pressure range ~10−5 mbar. By processing the video-PEEM images of ongoing catalytic reaction, the kinetic transitions were tracked for individual [110]-oriented domains. The obtained local kinetic phase diagrams were contrasted to those obtained from global MS activity measurements. These data and the observation of reaction front propagation on different Pt(110) domains indicate a quasi-independent behaviour of the crystallographic domains. The observed front propagation velocities and the degree of their anisotropy on Pt foil corroborate earlier observations on Pt(110) single crystals, confirming our concept of using Pt foil to monitor and compare different surface terminations in parallel.

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Acknowledgments

The authors would like to thank Johannes Frank (IMC, TU Vienna) for technical assistance. Financial support by TU Vienna in frame of the IP2010 “He-SMS” and by ÖAD, project 77ÖU14, is acknowledged.

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Authors and Affiliations

  1. Institute of Materials Chemistry, Vienna University of Technology, Getreidemarkt 9, 1060, Vienna, Austria

    Ch. Spiel, D. Vogel, Y. Suchorski, W. Drachsel & G. Rupprechter

  2. Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195, Berlin, Germany

    D. Vogel & R. Schlögl

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  1. Ch. Spiel
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  2. D. Vogel
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  3. Y. Suchorski
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  4. W. Drachsel
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  6. G. Rupprechter
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Correspondence to Y. Suchorski.

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Spiel, C., Vogel, D., Suchorski, Y. et al. Catalytic CO Oxidation on Individual (110) Domains of a Polycrystalline Pt Foil: Local Reaction Kinetics by PEEM. Catal Lett 141, 625–632 (2011). https://doi.org/10.1007/s10562-011-0562-x

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  • DOI: https://doi.org/10.1007/s10562-011-0562-x

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