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
In-situ observations of catalytic surface reactions with soft x-rays under working conditions.
Ryo Toyoshima,Hiroshi Kondoh +1 more
TL;DR: Recent new findings on catalytically active surfaces using soft x-ray techniques, particularly focusing on the NAP-XPS technique are presented and a perspective on the future direction of this emerging technique is given.
Journal ArticleDOI
Rationalizing the Relation between Adlayer Structure and Observed Kinetics in Catalysis
TL;DR: In this article, the authors apply a theoretical approach to rationalize these observations, using first-principles kinetic Monte Carlo simulations, and employ an analysis that decomposes the overall order into two contributions: one pertaining to the adlayer structure and one quantifying coverage effects on the elementary events' rates.
Journal ArticleDOI
Pd6O4+: an oxidation resistant yet highly catalytically active nano-oxide cluster.
TL;DR: Gas-phase reaction kinetics measurements in conjunction with first-principles calculations provide detailed molecular level insight into the nano-oxide cluster chemistry and are able to reveal the full catalytic combustion reaction cycle.
Journal ArticleDOI
CO oxidation by atomically adsorbed oxygen on Ag(110) in the temperature range 100–300 K
Uwe Burghaus,Horst Conrad +1 more
TL;DR: In this paper, the catalytic CO oxidation reaction with atomically adsorbed oxygen on Ag(110) has been analyzed by means of molecular beam titration, molecular beam relaxation (MBRS), qualitative LEED, and reactive thermal desorption measurements (RTDS).
Journal ArticleDOI
Scattering of atomic and molecular beams at metal surfaces
TL;DR: The principles, variable parameters and potential information underlying experiments which involve the scattering of neutral particles with thermal kinetic energies at metal surfaces are briefly outlined in this paper, where a few examples for the application of ground-state particles are presented: Diffractive scattering, studies on the kinetics of adsorption and desorption as well as reactive scattering.
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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