Efficient CO oxidation at low temperature on Au(111)

Byoung Koun Min, A. R. Alemozafar, D. Pinnaduwage, X. Deng, C. M. Friend

Research output: Contribution to journalArticle

128 Citations (Scopus)

Abstract

The rate of CO oxidation to CO 2 depends strongly on the reaction temperature and characteristics of the oxygen overlayer on Au(111). The factors that contribute to the temperature dependence in the oxidation rate are (1) the residence time of CO on the surface, (2) the island size containing Au-O complexes, and (3) the local properties, including the degree of order of the oxygen layer. Three different types of oxygen-defined as chemisorbed oxygen, a surface oxide, and a bulk oxide-are identified and shown to have different reactivity. The relative populations of the various oxygen species depend on the preparation temperature and the oxygen coverage. The highest rate of CO oxidation was observed for an initial oxygen coverage of 0.5 monolayers that was deposited at 200 K where the density of chemisorbed oxygen is maximized. The rate decreases when two-dimensional islands of the surface oxide are populated and further decreases when three-dimensional bulk gold oxide forms. Our results are significant for designing catalytic processes that use Au for CO oxidation, because they suggest that the most efficient oxidation of CO occurs at low temperature-even below room temperature-as long as oxygen could be adsorbed on the surface.

Original languageEnglish
Pages (from-to)19833-19838
Number of pages6
JournalJournal of Physical Chemistry B
Volume110
Issue number40
DOIs
Publication statusPublished - 2006 Oct 12
Externally publishedYes

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Carbon Monoxide
Oxygen
Oxidation
oxidation
oxygen
Oxides
Temperature
oxides
Gold
Monolayers
reactivity
gold
temperature dependence
preparation
temperature
room temperature

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

Min, B. K., Alemozafar, A. R., Pinnaduwage, D., Deng, X., & Friend, C. M. (2006). Efficient CO oxidation at low temperature on Au(111). Journal of Physical Chemistry B, 110(40), 19833-19838. https://doi.org/10.1021/jp0616213

Efficient CO oxidation at low temperature on Au(111). / Min, Byoung Koun; Alemozafar, A. R.; Pinnaduwage, D.; Deng, X.; Friend, C. M.

In: Journal of Physical Chemistry B, Vol. 110, No. 40, 12.10.2006, p. 19833-19838.

Research output: Contribution to journalArticle

Min, BK, Alemozafar, AR, Pinnaduwage, D, Deng, X & Friend, CM 2006, 'Efficient CO oxidation at low temperature on Au(111)', Journal of Physical Chemistry B, vol. 110, no. 40, pp. 19833-19838. https://doi.org/10.1021/jp0616213
Min BK, Alemozafar AR, Pinnaduwage D, Deng X, Friend CM. Efficient CO oxidation at low temperature on Au(111). Journal of Physical Chemistry B. 2006 Oct 12;110(40):19833-19838. https://doi.org/10.1021/jp0616213
Min, Byoung Koun ; Alemozafar, A. R. ; Pinnaduwage, D. ; Deng, X. ; Friend, C. M. / Efficient CO oxidation at low temperature on Au(111). In: Journal of Physical Chemistry B. 2006 ; Vol. 110, No. 40. pp. 19833-19838.
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