Détermination de la distribution d'énergie de liaison de gaz adsorbés sur des films métalliques application au système PtO2

Ehrhardt, J.J.; Vincent, Laure; Cassuto, A.; Malengé, Jean-Pierre

doi:10.1016/0039-6028(71)90010-0

Cited by 9 publications

(1 citation statement)

References 6 publications

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“…Due to its greater stability, the FC was used in making all pressure calibrations of the mass spectrometer. However, the product detection from cyclohexane In recent years there have been a number of studies of adsorption of oxygen on both polycrystalline and single crystal platinum surfaces (29)(30)(31)(32)(33)(34)(35)(36)(37)(38)(39)(40)(41)(42)(43)(44)(45)(46). The oxygen adsorption is thought to be dissociative except at very low temperature (34)(35)(36).…”

Section: Uncertainties In the Pumping Speed And Gain Of The Electron mentioning

confidence: 99%

Catalysis by platinum single crystal surfaces: low pressure hydrocarbon reactions and the effects of introducing strongly bound oxygen at the surface

Smith¹

1978

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Section: Uncertainties In the Pumping Speed And Gain Of The Electron mentioning

confidence: 99%

Catalysis by platinum single crystal surfaces: low pressure hydrocarbon reactions and the effects of introducing strongly bound oxygen at the surface

Smith¹

1978

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Kinetische Analyse von Komplexen Desorptionsreaktionen

Kirchhof

Hobert

1977

Journal of Thermal Analysis

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The effect of strongly bound oxygen on the dehydrogenation and hydrogenation activity and selectivity of platinum single crystal surfaces

Smith¹

1979

Journal of Catalysis

128

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The dehydrogenation of cyclohexene and cyclohexane, and. the hydrogenation of cyclohexenewere studied on the clean and preoxidized surfaces of three platinum single crystals-a Pt(lll), a stepped Pt(S)-[6(111)x(100).] and a kinked Pt(S)-[7(111)x(3l0)]at low pressure (10-6 to 10-Storr total pressure), at 150°C. Oxygen coverages were monitored by Auger electron spectroscopy (AES) , an Auger peak ratio of 0SlO/Pt 237 = .5 having been determined to 14 2 correspond to approximately 5 x 10 oxygen atoms/cm. The surface structures of the clean and oxidized platinum crystals were determined by low energy electron diffraction (LEBD): after high temperature (800°C) oxygen treatment, the predominant oxygen structure observed on the Pt(lll) was a (~x2); the, predominant oxygen structure observed on both the Pt(S)-[6("111)x(100)] and the Pt(S)-[7(111)x (310)] was a (i3 x 13)-R30°. Low coverages of strongly bound oxygen enhanced the rates of the dehydrogenation and hydrogenation reactions, and changed the selectivity of cyclohexene dehydrogenation to benzene over hydrogenation to cyclohexane. These effects of preoxidation on catalytic rates and selectivity were found to be sensitive to the structure of the platinum surface, kink sites playing a particularly active role in the enhancement of dehydrogenation and hydrogenation activity by strongly bound oxygen. Three models are discussed which relate the oxidation of platinurn surfaces to the observed effects on catalytic reactivity and the structure sensitivity. A change in the electronic structure of the platinum surface through oxidatmnprovides the best general model for explaining the oxygen effects, though complex formation iii involving the adsorbed oxygen or surface reconstruction during oxidation may also be important.

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Détermination de la distribution d'énergie de liaison de gaz adsorbés sur des films métalliques application au système PtO2

Cited by 9 publications

References 6 publications

Catalysis by platinum single crystal surfaces: low pressure hydrocarbon reactions and the effects of introducing strongly bound oxygen at the surface

Catalysis by platinum single crystal surfaces: low pressure hydrocarbon reactions and the effects of introducing strongly bound oxygen at the surface

Kinetische Analyse von Komplexen Desorptionsreaktionen

The effect of strongly bound oxygen on the dehydrogenation and hydrogenation activity and selectivity of platinum single crystal surfaces

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