Adsorbate induced reconstruction by strong chemisorption: Ru(001)p(2×2)-O

Lindroos, M.; Pfnür, H.; Held, Georg; Menzel, D.

doi:10.1016/0039-6028(89)90371-3

Cited by 174 publications

(117 citation statements)

References 17 publications

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“…For transition metal surfaces the most stable oxygen structures are more open, whereas overlayers with smaller lattice constants, that are found in some cases at larger exposures, do not form islands on the bare surface; typical examples are the (2ϫ2) and (2ϫ1) overlayers on Ru͑0001͒. 30,31 ͑The (1ϫ1) structure prepared recently on this surface was obtained only by using NO 2 .͒ 32,33 Attractive nearest-neighbor interactions between O ad underlying the formation of the (1 ϫ1) structure on Al͑111͒ is therefore an important result. It is supported by a recent density functional calculation 5 in which the (1ϫ1) structure was found to be by 0.5 eV/atom more stable than a (2ϫ2) structure, which was explained by the unusual strength of the Al-O bond.…”

Section: Discussionmentioning

confidence: 99%

Interaction of oxygen with Al(111) at elevated temperatures

Trost

Brune

Wintterlin

et al. 1998

The Journal of Chemical Physics

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The interaction of oxygen with Al͑111͒ was investigated by STM at temperatures between 350 and 530 K, by annealing an oxygen precovered surface and by adsorption of oxygen on the hot surface. For exposures up to 10 L and temperatures up to 470 K a considerable part of the oxygen exists still in the chemisorbed state, another part transforms into Al oxide. In contrast to 300 K chemisorbed O ad atoms are mobile at elevated temperatures, and compact, hexagonal (1ϫ1)O ad islands develop by an ordinary nucleation and growth scheme. This evidences attractive interactions between the oxygen atoms on (1ϫ1) sites. From the lateral distribution of O ad islands a diffusion barrier of 1.0-1.1 eV is derived. The imaging of the islands of the (1ϫ1) phase by STM depends on their size, which is understood by a different imaging of the O ad /Al adsorbate complexes at the island borders. Defects in the islands and bright features at the edges are interpreted as nuclei of aluminum oxide. Additional features which appear as topographic holes may be attributed to nonconducting Al oxide grains.

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Section: Discussionmentioning

confidence: 99%

Interaction of oxygen with Al(111) at elevated temperatures

Trost

Brune

Wintterlin

et al. 1998

The Journal of Chemical Physics

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“…4d. The geometry of these structures corresponds to hydrogen and vacancies in fcc-hollow sites and O in hcp-hollow sites, as in the clean Ru surface [30]. The interesting observation is that in spite of the very high coverage of H, close to saturation, oxygen atom forbids the hydrogen atom taking six nearest fcc-hollow ruthenium sites.…”

Section: Effect Of Oxygen Impuritiesmentioning

confidence: 93%

“…Past experiments have shown that they strongly influence the adsorption and diffusion of hydrogen [6,9]. Since atomic oxygen chemisorbs on Ru(001) hcp-hollow sites [30], it was even suggested that O may force H to adsorb on the hcp-hollow site [6].…”

Section: Effect Of Oxygen Impuritiesmentioning

confidence: 99%

Hydrogen adsorption on Ru(001) studied by scanning tunneling microscopy

et al. 2008

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“…At Θ O =1/4, a (2 × 2)-O phase forms 25 . Here Θ O = 1 means that there are as many O atoms as there are Ru atoms in the top layer.…”

Section: Oxygen On Rutheniummentioning

confidence: 99%

Density-functional theory study of the catalytic oxidation of CO over transition metal surfaces

Stampfl

Scheffler

1999

Surface Science

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In recent years due to improvements in calculation methods and increased computer power, it has become possible to perform first-principles investigations for "simple" chemical reactions at surfaces. We have carried out such studies for the catalytic oxidation of CO at transition metal surfaces, in particular, at the ruthenium surface for which unusual behavior compared to other transition metal catalysts has been reported. High gas pressure catalytic reactor experiments have revealed that the reaction rate over Ru for oxidizing conditions is the highest of the transition metals considered -in contrast, under ultra high vacuum conditions, the rate is by far the lowest. We find that important for understanding the pressure dependence of the reaction is the fact that Ru (0001) can support high concentrations of oxygen at the surface. Under these conditions, the O-metal bond is atypically weak compared to that at lower coverages. We have investigated a number of possible reaction pathways for CO oxidation for the conditions of high oxygen coverages, including scattering reactions of gas-phase CO at the oxygen covered surface (Eley-Rideal mechanism) as well as the Langmuir-Hinshelwood mechanism involving reaction between adsorbed CO molecules and O atoms.PACSnumbers: 82.65.J, 71.10, 82.65.M

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Adsorbate induced reconstruction by strong chemisorption: Ru(001)p(2×2)-O

Cited by 174 publications

References 17 publications

Interaction of oxygen with Al(111) at elevated temperatures

Interaction of oxygen with Al(111) at elevated temperatures

Hydrogen adsorption on Ru(001) studied by scanning tunneling microscopy

Density-functional theory study of the catalytic oxidation of CO over transition metal surfaces

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