Journal ArticleDOI
A molecular beam investigation of the catalytic oxidation of CO on Pd (111)
T. Engel,Gerhard Ertl +1 more
TLDR
In this paper, a detailed investigation of the steady-state and nonsteady-state reaction CO+1/2O2→CO2 on Pd (111) has been carried out with the molecular beam technique.Abstract:
A detailed investigation of the steady‐state and nonsteady‐state reaction CO+1/2O2→CO2 on Pd (111) has been carried out with the molecular beam technique. It could be shown conclusively that the reaction proceeds between two adsorbed species (Langmuir–Hinshelwood mechanism) throughout the temperature and pressure range investigated. For low CO coverages, the activation energy of the reaction was determined to be 25 kcal/mole, whereas at moderate CO coverages, a rearrangement of the oxygen adlayer takes place resulting in a reduction of the activation energy to 14 kcal/mole. It is not possible to formulate a simple kinetic expression for the reaction rate which is valid over the entire range of temperatures and pressures due to changes in the adsorption rate for O2, coadsorption of CO and O2, to diffusion in the adlayer, and to changes in the geometrical arrangement within the adlayer with varying coverage.read more
Citations
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Journal ArticleDOI
The kinetics of the interactions of O2 and N20 with a Cu(110) surface and of the reaction of CO with adsorbed oxygen studied by means of ellipsometry, AES and LEED
F.H.P.M. Habraken,G.A. Bootsma +1 more
TL;DR: In this article, the changes in the ellipsometric angles Δ and ψ per oxygen atom upon adsorption and removal of oxygen depend on the coverage θ, the temperature and on the azimuth of the plane of incidence of the light beam.
Journal ArticleDOI
UHV studies of the interaction of CO with small supported metal particles, Ni/mica
TL;DR: In this paper, the interaction of carbon monoxide with small palladium particles supported on UHV-cleaved and heat-treated single-crystal mica was studied.
Journal ArticleDOI
Surface diffusion of hydrogen and CO on Rh(111): Laser‐induced thermal desorption studies
TL;DR: In this article, surface diffusion of hydrogen, deuterium, and CO on Rh(111) has been investigated by laser-induced thermal desorption (LITD) and compared with previous results for these species on Pt(111), and on other metals.
Journal ArticleDOI
Mathematical modeling of kinetic oscillations in the catalytic CO oxidation on Pd(110): The subsurface oxygen model
M. R. Bassett,Ronald Imbihl +1 more
TL;DR: In this article, a set of coupled differential equations was established describing the variations in the absorbate coverages ΘO and ΘCO and in the subsurface oxygen concentration for the system Pd(110)/CO+O2.
References
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Journal ArticleDOI
Molecular beam study of the apparent activation barrier associated with adsorption and desorption of hydrogen on copper
TL;DR: In this article, the adsorption and desorption of H2 on the (100, (110), and stepped (310) crystal faces of copper was studied. And the energy and incident angle of the H2 beam were measured by a rotatable mass spectrometer.
Journal ArticleDOI
Adsorption of oxygen and oxidation of CO on the ruthenium (001) surface
TL;DR: The adsorption of oxygen on the ruthenium (001) surface has been studied using a combination of techniques: LEED/Auger, Kelvin probe contact potential changes, and flash desorption mass spectrometry as mentioned in this paper.
Journal ArticleDOI
Interaction of NO and O2 with Pd(111) surfaces. II
TL;DR: The surface region of Pd(111) is characterized by three different types of oxygen atoms, which may be distinguished by their thermal, chemical, structural and electronic properties as discussed by the authors.
Journal ArticleDOI
Angular distribution of hydrogen molecules desorbed from metal surfaces
TL;DR: In this paper, the angular distribution of desorbeded H2 molecules has been studied and the measured angular distributions are strongly peaked forward, indicating that they are not uniformly distributed.
Journal ArticleDOI
Chemisorption und katalytische Reaktion von Sauerstoff und Kohlenmonoxid an einer Palladium (110)-Oberfläche
Gerhard Ertl,P. Rau +1 more
TL;DR: In this article, the adsorption and catalytic reaction of oxygen and carbon monoxide on a Pd(110) surface has been studied by means of low energy electron diffraction (LEED) and mass spectrometric techniques.
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