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
Systematic Study of the Hydrogen Storage Properties and the CO-oxidizing Abilities of Solid Solution Alloy Nanoparticles in an Immiscible Pd–Ru System
TL;DR: PdxRu1-x solid solution alloy nanoparticles were successfully synthesized over the whole composition range through the chemical reduction method, although Ru and Pd are immiscible at the atomic level in the bulk state.
Journal ArticleDOI
Unravelling CO oxidation reaction kinetics on single Pd nanoparticles in nanoconfinement using a nanofluidic reactor and DSMC simulations
Sangita Swapnasrita,David Albinsson,Georg R. Pesch,Henrik Ström,Christoph Langhammer,Lutz Mädler +5 more
TL;DR: In this paper, the effect of various adsorption (sticking coefficient, saturation coverage, desorption, activation energy, preexponential factor) and reaction (activation barrier) parameters on the final CO2 turnover were determined.
Journal Article
Diffusion of chemisorbed oxygen into Pd sub-surfaces and its influence in oxidation catalysis
TL;DR: Oxygen migration to subsurface layers of palladium and its influence in catalytic oxidation has been addressed in this article, where the authors highlight the oxygen diffusion into Pd-sub surfaces and its characterization by several methods.
Journal ArticleDOI
Reaction kinetic behavior of different carbon monoxide adspecies on palladium—alumina during oxidation: An in‐situ IR study
Geng-Yu Cao,Biug-Nan Jiang +1 more
TL;DR: Carbon monoxide oxidation on Pd(10 w.t.%)-alumina was studied by in-situ infrared spectroscopy as mentioned in this paper, and it was found that the oxidation reactivities vary with different CO adspecies: linear COad > 2-fold bridged COAD > multi-bridged COad.
Journal ArticleDOI
Competing ternary surface reaction CO + O 2 + H 2 on Ir(111).
TL;DR: In this study, a model for approaching the competing surface reactions CO+O2 + H2 is presented and discussed, and it is shown how the steady states of the extended system correspond to a swallowtail catastrophe set with a tristable regime within the swallowtail.
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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