The formation of subsurface oxygen on Pt(100)

Rotermund, Harm Hinrich; Lauterbach, Jochen A.; Haas, G.A.

doi:10.1007/bf00331749

Cited by 91 publications

(44 citation statements)

References 17 publications

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“…We note that Rotermund et al [45] already suggested thermodynamically stable subsurface oxygen to explain a change in work function for Pt(100) when the oxygen-covered surface was heated from 360 to 600 K. Furthermore, they observed desorption of the subsurface oxygen at 760 K, which is lower but comparable to what we observe for Pt(111), and the reactivity of subsurface O towards CO oxidation similar to ours [46].…”

Section: Resultssupporting

confidence: 89%

Subsurface Oxygen on Pt(111) and Its Reactivity for CO Oxidation

et al. 2011

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Temperature has an important effect on the dissociative adsorption of molecular oxygen on platinum surfaces. Here, we show that if the substrate temperature is increased to 400-600 K, the total amount of oxygen loaded onto Pt(111) can be more than twice the well-established maximum coverage of 0.25 ML. While low energy electron diffraction and STM reveal a conventional p(2 9 2) structure of the topmost layer, temperature programmed desorption measurements indicate that additional oxygen is stored under the surface of platinum. Reactivity measurements show that this sub-surface oxygen layer does not lower the activity of such platinum surface towards CO oxidation. Therefore, while sub-surface oxygen layer does form under catalytically relevant temperatures on Pt(111), it has no great influence on the oxidizing ability of such surface. This sheds new light on the initial stages of platinum oxide formation, and may help bridge the understanding of catalytic oxidation of CO on Pt in ultra high vacuum and in high-pressure catalysis studies.

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Section: Resultssupporting

confidence: 89%

Subsurface Oxygen on Pt(111) and Its Reactivity for CO Oxidation

et al. 2011

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“…Here y 1 is the critical concentration of CO at which an SRS starts, while y 2 is the critical concentration of CO where an SRS stops. Experiments show that the production of CO 2 starts as soon as y CO departs from zero [9][10][11]. Inspired by the work of Ziff et al [7], different authors have studied variants of the ZGB model [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27] .…”

Section: Introductionmentioning

confidence: 99%

Effect of experimentally observed hot atom adsorption mechanism on the phase diagram of monomer-dimer catalytic reaction on Pt(111): a Monte-Carlo simulation study

et al. 2006

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The effect of experimentally observed hot atom mechanism on the phase diagram using Pt (111) surface of the monomer-dimer reaction has been studied. While using this mechanism, whenever O 2 molecule hits the randomly vacant selected site, it breaks up into atomic form and then executes ballistic flight. The path of the two oxygen atoms is taken exactly opposite to each other i.e. anti-parallel and range of the atoms is taken equal i.e. they may fly upto 1 and 1.73 atomic spacing from the site of impact . Two cases have been studied on the basis of the range of hot atoms. The steady reactive window is observed and the continuous transition disappears. As soon as the CO partial pressure departs from zero the production of CO 2 is observed, which clearly verifies the experimental observation.

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“…The studies of the reaction fronts formed during the chemical reaction on single crystal surface have been considered as a first step in the comprehension and in the formulation of realistic models [71,72]. As discussed below, an impressive variety of different chemical wave patterns has been found in recent years [73,74]. Moreover the temporal resolution of PEEM (few ms) is always sufficient for the observed dynamical process.…”

Section: The Spectromiscroscopymentioning

confidence: 99%

Soleil a New Powerful Tool for Materials Science

Baudelet

Belkhou

Briois

et al. 2005

Oil & Gas Science and Technology - Rev. IFP

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Résumé -SOLEIL, un nouvel outil puissant pour les sciences des matériaux -À l'aube des premiers photons disponibles sur l'anneau synchrotron de troisième génération SOLEIL, un état des possibilités offertes en sciences des matériaux sera présenté. La brillance exceptionnelle de cette machine permettra de réduire de plusieurs ordres de grandeur les temps d'acquisition typiques des différentes techniques synchrotrons (spectroscopie d'absorption-EXAFS, diffusion X aux petits et grands angles-SAXS et WAXS, diffraction des rayons X -XRD, spectroscopies et microscopie de photoélectrons -XPS et PEEM, etc.) les transformant en véritables techniques operando pour la caractérisation des matériaux et plus particulièrement des catalyseurs. La résolution spatiale à l'échelle de quelques microns et même submicronique, accessible par microdiffraction et microspectroscopie dans un domaine s'étendant de l'IR lointain aux X durs, pourra être mise à profit pour réaliser une cartographie atomiquement sélective de matériaux, du catalyseur hétérogène en action aux roches réservoirs. Un ensemble de techniques in situ permettra d'accéder à la réactivité de surfaces et de nanoparticules exposées à des flux gazeux contrôlés. La combinaison des techniques synchrotrons (diffraction, absorption et fluorescence X, etc.) ou l'apport d'informations complémentaires par combinaison simultanée de techniques classiques (Raman, UV-Vis, etc.) avec les techniques du synchrotron seront enfin un atout majeur pour la caractérisation operando des matériaux.Abstract -SOLEIL a New Powerful Tool for Materials Science -The first photons delivered by the third generation synchrotron source SOLEIL will be soon available for the scientific community. In this context, this paper presents an overview of the potentialities offered by this new machine for the study of materials. The outstanding brilliance of the SOLEIL source will enable to reduce by several orders of magnitude the data collection time for most of the synchrotron techniques (X-ray absorption spectroscopy -EXAFS, wide and small angle X-ray scattering -WAXS and SAXS, X-ray diffraction -XRD, photoelectron spectroscopy and microscopy-XPS and PEEM, etc.)

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The formation of subsurface oxygen on Pt(100)

Cited by 91 publications

References 17 publications

Subsurface Oxygen on Pt(111) and Its Reactivity for CO Oxidation

Subsurface Oxygen on Pt(111) and Its Reactivity for CO Oxidation

Effect of experimentally observed hot atom adsorption mechanism on the phase diagram of monomer-dimer catalytic reaction on Pt(111): a Monte-Carlo simulation study

Soleil a New Powerful Tool for Materials Science

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