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  Carbonate formation on the O-enriched RuO2(110) surface

Lafosse, A., Wang, Y., & Jacobi, K. (2002). Carbonate formation on the O-enriched RuO2(110) surface. Journal of Chemical Physics, 117(6), 2823-2831. doi:10.1063/1.1490339.

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 Creators:
Lafosse, Anne1, Author           
Wang, Yuemin1, Author           
Jacobi, Karl1, Author           
Affiliations:
1Physical Chemistry, Fritz Haber Institute, Max Planck Society, ou_634546              

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Free keywords: CO2 ADSORPTION; ACTIVATION; DIOXIDE; SPECTROSCOPY; REACTIVITY; OXIDATION; Ru(0001)
 Abstract: The reaction of CO2 to carbonate CO3delta- is studied on the O-enriched RuO2(110) surface using thermal desorption spectroscopy and high-resolution electron energy-loss spectroscopy. It is known that the epitaxially grown RuO2(110) surface exposes coordinatively unsaturated sites, so-called Ru-cus and O-bridge, and can be O-enriched by dissociative adsorption of O-2 giving rise to weakly bound O-cus atoms on top of Ru-cus. CO2 adsorption at 85 K and annealing up to 250 K, results in a stepwise increased carbonate CO3delta- formation which takes place only on Ru-cus sites. Based on isotope substitution experiments the carbonate-related losses are identified among them the symmetric stretching mode at 150.8 meV and the asymmetric one at 174.9 meV. Through interaction of CO2delta- with O-cus, both chemisorbed on neighboring Ru-cus sites, a bidentate transient state and finally a monodentate carbonate CO3delta- is formed. The molecular plane of monodentate CO3delta- is oriented perpendicular to the surface with a tilted RuO-CO2 axis. The maximum carbonate coverage is about 25%.

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Language(s): eng - English
 Dates: 2002-08-08
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 8313
DOI: 10.1063/1.1490339
 Degree: -

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Title: Journal of Chemical Physics
  Alternative Title : J. Chem. Phys.
Source Genre: Journal
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Pages: - Volume / Issue: 117 (6) Sequence Number: - Start / End Page: 2823 - 2831 Identifier: -