Abstract
The catalytic properties of Pt, which have been studied in a variety of forms of the metal (single crystals, wires or dispersed on a support), may be influenced by the method of preparing the metal surface. Pt surfaces undergo retexturing1 during catalytic reactions at high temperatures (>1,000 K) and a relatively facile sintering process has also been described2. Engel and Ertl3 have reviewed the heterogeneous oxidation of carbon monoxide on Pt (CO + 1/2 O2 → CO2), emphasizing studies concerned with the behaviour of the reaction at very low pressures and on clean surfaces (for example, on single crystal faces). Under these conditions the kinetic behaviour is determined by the ratio of the partial pressures of the reactants and is relatively insensitive to the total pressure. Here, we describe microscopic and kinetic observations of the oxidation on Pt wire surfaces below 600 K and at atmospheric pressure. The surface reactions are apparently more complicated here than at low pressure; extrapolations from the low to the high pressure regimes may not be applicable because of changes in the rate-controlling parameters. We present evidence of the mobility of Pt atoms (often considered immobile) on the surface and suggest that the catalyst functions through formation of oxy- and/or carboxyl-Pt complexes in a two-dimensional chemisorbed layer, envisaged as a monolayer possessing fluid properties and enhanced reactivity, containing both adsorbed reactant gases and mobile catalyst atoms.
This is a preview of subscription content, access via your institution
Access options
Subscribe to this journal
Receive 51 print issues and online access
$199.00 per year
only $3.90 per issue
Buy this article
- Purchase on Springer Link
- Instant access to full article PDF
Prices may be subject to local taxes which are calculated during checkout
Similar content being viewed by others
References
Flytzani-Stephanopoulos, M., Wong, S. & Schmidt, L. D. J. Catal. 49, 51–82 (1977).
Baird, T., Paál, Z. & Thomson, S. J. J. chem. Soc. Faraday Trans. I 69, 50–55 (1973).
Engel, T. & Ertl, G. Adv. Catal. 28, 1–78 (1979).
Gray, P., Griffiths, J. F. & Rogerson, J. S. Am. Soc. Mech. Engng 79-HT-56, 1–8 (1979).
Jones, A., Firth, J. G. & Jones, T. A. J. Sci. Instrum. 8, 37–40 (1975).
Rogerson, J. thesis, Univ. Leeds (1983).
McCabe, R. W., Pignet, T. & Schmidt, L. D. J. Catal. 32, 114–126 (1974).
Barteau, M. A., Ko., E. I. & Modix, R. J. Surf. Sci. 104, 161–180 (1981).
Gland, J. L. & Kollin, E. B. J. chem. Phys. 78, 963–974 (1983).
Galwey, A. K. Thermal Analysis, Proc. 7th Int. Conf., 38–53 (Wiley, Chichester, 1982).
McKinney, P. V. J. Am. chem. Soc. 56, 2577–2580 (1934).
Ducros, R. & Merrill, R. P. Surf. Sci. 55, 227–245 (1976).
Berry, R. J. Surf. Sci. 76, 415–442 (1978).
Bonzel, H. P. & Ku, R. J. Vac. Sci. Technol. 9, 663–667 (1972).
Boreskov, G. K. Adv. Catal. 15, 285–339 (1964).
Galwey, A. K. Adv. Catal. 26, 247–322 (1977).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Galwey, A., Gray, P., Griffiths, J. et al. Surface retexturing of Pt wires during the catalytic oxidation of CO. Nature 313, 668–671 (1985). https://doi.org/10.1038/313668a0
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1038/313668a0
This article is cited by
-
Efficient CO oxidation catalyzed by nickel supported on Ta2O5
Brazilian Journal of Chemical Engineering (2023)
-
Thermal reactions involving solids: a personal view of selected features of decompositions, thermal analysis and heterogeneous catalysis
Journal of Thermal Analysis and Calorimetry (2020)
-
Catalytic oxidation of hydrogen on platinum
Journal of Thermal Analysis and Calorimetry (2013)
-
Catalytic oxidation of CO on platinum
Journal of Thermal Analysis and Calorimetry (2013)
-
Subsurface Oxygen on Pt(111) and Its Reactivity for CO Oxidation
Catalysis Letters (2012)
Comments
By submitting a comment you agree to abide by our Terms and Community Guidelines. If you find something abusive or that does not comply with our terms or guidelines please flag it as inappropriate.