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
Oxygen Activation and Reaction on Pd–Au Bimetallic Surfaces
TL;DR: In this article, the authors used reactive molecular beam scattering (RMBS), reflection-absorption infrared spectroscopy (RAIRS), temperature-programmed desorption (TPD), and density functional theory (DFT) techniques in an attempt to enhance the fundamental understanding of oxygen activation and reaction with CO on Pd-Au surfaces.
Journal ArticleDOI
Size Dependent Reaction Kinetics on Supported Model Catalysts: A Molecular Beam/IRAS Study of the CO Oxidation on Alumina-Supported Pd Particles
TL;DR: In this article, molecular beam techniques combined with in situ IR reflection absorption spectroscopy were used to study the CO oxidation kinetics on oxide-supported model catalysts, and the results showed that the results were similar to ours.
Journal ArticleDOI
Kinetic measurements of hydrocarbon conversion reactions on model metal surfaces.
TL;DR: The main tools available to surface scientists for the determination of the kinetics of surface reactions are presented and an analysis of the power of isotope labeling and chemical substitutions in mechanistic research on surface reactions is presented.
Journal ArticleDOI
CO adsorption over Pd nanoparticles: A general framework for IR simulations on nanoparticles
Constantinos D. Zeinalipour-Yazdi,Constantinos D. Zeinalipour-Yazdi,David J. Willock,Liam Thomas,Karen Wilson,Adam F. Lee +5 more
TL;DR: In this article, a DFT-based analysis of the CO vibrational spectra over catalytic nanoparticles under high coverages/pressures is discussed from an infrared (IR) spectra perspective.
Journal ArticleDOI
An XPS and UPS study of the kinetics of carbon monoxide oxidation over Ag(111)
T.E. Felter,W. H. Weinberg,G. Ya. Lastushkina,Andrei I. Boronin,P.A. Zhdan,G.K. Boreskov,J. Hrbek +6 more
TL;DR: In this article, the Eley-Rideal mechanism is mimicked in the case of carbon monoxide over a Ag(111) catalyst and a negative activation energy, −1.7 kcal/mole, and a preexponential, 6 × 10 −18 cm 2, are found.
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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