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Efficient CO oxidation at low temperature on Au(111).

B K Min1, A R Alemozafar, D Pinnaduwage

  • 1Department of Chemistry and Chemical Biology, Harvard University, 12 Oxford Street, Cambridge, Massachusetts 02138, USA.

The Journal of Physical Chemistry. B
|October 6, 2006
PubMed
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The rate of carbon monoxide (CO) oxidation to carbon dioxide (CO2) on gold (Au) surfaces is highly sensitive to temperature and oxygen layer properties. Optimal CO oxidation occurs at low temperatures with specific oxygen adsorption conditions.

Area of Science:

  • Surface Science
  • Heterogeneous Catalysis
  • Materials Chemistry

Background:

  • Carbon monoxide (CO) oxidation is crucial for catalysis, particularly for gold (Au) nanoparticles.
  • Understanding the CO oxidation mechanism on Au(111) surfaces is essential for designing efficient catalytic converters.
  • The role of different oxygen species and their impact on reaction kinetics requires further investigation.

Purpose of the Study:

  • To investigate the temperature dependence of CO oxidation on Au(111).
  • To identify and characterize different oxygen species present on the Au(111) surface.
  • To correlate the reactivity of oxygen species with their structural properties and coverage.

Main Methods:

  • Utilizing surface science techniques to study CO oxidation kinetics on Au(111).

Related Experiment Videos

  • Characterizing various oxygen species, including chemisorbed oxygen, surface oxide, and bulk oxide.
  • Analyzing the influence of preparation temperature and oxygen coverage on oxygen species formation and reactivity.

    • Main Results:

    • CO oxidation rate is strongly dependent on reaction temperature and the nature of the oxygen overlayer.
    • Three distinct oxygen species (chemisorbed, surface oxide, bulk oxide) exhibit different reactivities.
    • Maximum CO oxidation rate observed at 200 K with 0.5 monolayers of oxygen, maximizing chemisorbed oxygen density.
    • Oxidation rate decreases with the formation of surface and bulk gold oxides.

    Conclusions:

    • The efficiency of CO oxidation on Au surfaces is significantly influenced by the type and arrangement of adsorbed oxygen.
    • Low-temperature CO oxidation is feasible and highly efficient, even below room temperature, provided suitable oxygen adsorption is achieved.
    • These findings are critical for developing advanced catalytic processes utilizing gold for CO oxidation applications.