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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Book ChapterDOI
Adsorption and Reaction of CO2 on Metal Surfaces. Detection of an Intrinsic Precursor to Dissociation
TL;DR: In this article, the potential energy diagram of the CO2 reaction dynamics on transition metal surfaces is presented, which can be schematically represented in a simplified manner by the two-dimensional potential energy diagrams.
Journal ArticleDOI
Carbon-13 Kinetic Isotope Effects in the Catalytic Oxidation of Carbon Monoxide Over Pd/Al2O3
TL;DR: In this article, the C-13 kinetic isotope effects in the oxidation of CO by oxygen over a 0.5% Pd/γ-Al2O3 catalyst were experimentally determined in a temperature range of 323−413 K, and the following temperature dependence was found:
Journal ArticleDOI
Gas‐solid catalytic reactions with an extended DSMC model
TL;DR: In this paper, the authors studied the catalytic oxidation of CO inside highly porous nanoparticle layers in the transition regime using kinetic parameters from Pd(111) surfaces at ultra high vacuum conditions.
Journal ArticleDOI
Quantum chemical analysis of the eley-rideal and langmuir-hinshelwood mechanisms of the catalytic oxidation of carbon monoxide on the nickel surface
TL;DR: In this paper, the Eley-Rideal (ER) collision and Langmuir-Hinshelwood (LH) adsorption mechanisms of the oxidation of carbon monoxide on the nickel surface were analyzed.
Journal ArticleDOI
Molecular Beam Study of the Oxidation of Carbon Monoxide on a Regular Array of Palladium Clusters on Alumina
Georges Sitja,Claude Henry +1 more
TL;DR: In this paper, the reverse spillover of CO was studied on a hexagonal array of Pd clusters grown on an alumina ultrathin film on Ni3Al(111).
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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