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
Oscillatory oxidation of Co over a Pt catalyst
TL;DR: In this article, the authors reported measurements of the temporal oscillatory oxidation rates of CO over polycrystalline Pt wire and found that the oscillations are believed to occur between two branches of a Langmuir-Hinshelwood reaction mechanism.
Journal ArticleDOI
Size-dependent oxidation mechanism of supported Pd nanoparticles.
Tobias Schalow,Björn Brandt,David E. Starr,Mathias Laurin,Shamil K. Shaikhutdinov,Swetlana Schauermann,Jörg Libuda,Hans-Joachim Freund +7 more
Book ChapterDOI
Oscillatory Reactions in Heterogeneous Catalysis
TL;DR: In this article, the authors focus on the oscillatory reactions in heterogeneous catalysis, and they show that many surface reactions oscillate; probably all bimolecular oxidation reactions on transition metals will exhibit oscillations under some conditions.
Journal ArticleDOI
Interaction of oxygen with Pd(111): High effective O2 pressure conditions by using nitrogen dioxide
Barbara A. Banse,Bruce E. Koel +1 more
TL;DR: In this article, a model for the chemical state and desorption behavior of oxygen for these coverages is proposed, and the results for the interaction of atomic oxygen with Pd(111) are compared with the behavior of atomic hydrogen on Pd (111).
Journal ArticleDOI
Reactive scattering from solid surfaces
M.P. D'Evelyn,Robert J. Madix +1 more
TL;DR: An overview of reactive scattering, together with a brief description of the experimental requirements and a discussion of the data analysis in molecular beam relaxation spectrometry, can be found in this paper.
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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