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
More filters
Journal ArticleDOI
Structural stability and chemisorption properties of a stepped palladium surface: O2 and NO on Pd(331)
TL;DR: In this article, the Pd(331) surface is found to thermally facet at temperatures >900 K to a surface containing a mixture of (320), (230) and (111) planes.
Journal ArticleDOI
CO disproportionation over supported Pd particles: a TPD and static SIMS study
Vladimír Matolín,E. Gillet +1 more
TL;DR: In this paper, it was shown that the rate of surface carbon formation increases with both surface temperature and the CO coverage, and the smaller the particle size, the higher the carbon formation rate.
Journal ArticleDOI
Vibrational Relaxation of Adsorbed Molecules. Mechanisms and Manifestations in Chemical Reactions on Solid Surfaces
V. P. Zhdanov,Kirill I Zamaraev +1 more
TL;DR: The processes of vibrational relaxation, i.e., of the vibrational excitation and deexcitation of molecules, are known to play the key role in providing them with the energy needed to participate in chemical reactions as discussed by the authors.
Journal ArticleDOI
Interaction of O2 with Pd single crystals in the range 1–150 Torr: Oxygen dissolution and reaction
TL;DR: In this article, the authors studied the interaction of O2 with Pd(1 1 1 1), Pd (1 1 0) and Pd[1 0 0] in the pressure range 1-150 Torr by the techniques of temperature programmed decomposition (TPD), Auger electron spectroscopy (AES), and low energy electron diffraction (LEED).
Journal ArticleDOI
CO adsorption and desorption on size-selected Pdn/TiO2(110) model catalysts: Size dependence of binding sites and energies, and support-mediated adsorption
TL;DR: The results show evidence for efficient support-mediated adsorption (reverse-spillover) of CO initially impinging on TiO(2) to binding sites associated with the Pd clusters.
References
More filters
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.
Related Papers (5)
Interactions between oxygen and carbon monoxide on a Pd(111) surface
Elementary Steps in the Catalytic Oxidation of Carbon Monoxide on Platinum Metals
T. Engel,Gerhard Ertl +1 more