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The influence of preadsorbed oxygen on the adsorption of CO on two-dimensional Pd islands on a Rh (111) surface

Beutler, A. LU ; Sandell, A. LU ; Jaworowski, A. J. LU ; Wiklund, M. LU ; Nyholm, R. LU and Andersen, J. N. LU (1998) In Surface Science 418(2). p.457-465
Abstract

The influence of preadsorbed oxygen on the CO adsorption properties of a laterally heterogeneous bimetallic surface consisting of Pd islands on Rh(111) at a Pd coverage of 0.5 monolayers has been studied by high resolution core level photoemission. A surface consisting of clean Pd islands surrounded by oxygen-covered Rh(111) patches was prepared by predosing oxygen at room temperature. By applying core level photoemission to the Pd 3d5/2 and the C 1s levels, the adsorption of CO on this surface was studied with particular attention being paid to possible CO diffusion between the two surface parts. The CO molecules are found to diffuse from the oxygen-covered Rh(111) patches onto the Pd islands for low to medium CO exposures.... (More)

The influence of preadsorbed oxygen on the CO adsorption properties of a laterally heterogeneous bimetallic surface consisting of Pd islands on Rh(111) at a Pd coverage of 0.5 monolayers has been studied by high resolution core level photoemission. A surface consisting of clean Pd islands surrounded by oxygen-covered Rh(111) patches was prepared by predosing oxygen at room temperature. By applying core level photoemission to the Pd 3d5/2 and the C 1s levels, the adsorption of CO on this surface was studied with particular attention being paid to possible CO diffusion between the two surface parts. The CO molecules are found to diffuse from the oxygen-covered Rh(111) patches onto the Pd islands for low to medium CO exposures. This diffusion direction is opposite of that found previously for the 0.5 ML Pd on Rh(111) system with no oxygen predosing. This reversal of the diffusion direction is argued to be due to a large reduction of the CO adsorption energy on the Rh patches of the surface caused by the preadsorbed oxygen. © 1998 Elsevier Science B.V. All rights reserved.

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author
organization
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type
Contribution to journal
publication status
published
keywords
Adsorption kinetics, Carbon monoxide, Chemisorption, Oxygen, Palladium, Rhodium, Single crystal surfaces, Surface diffusion, Synchrotron radiation photoelectron spectroscopy
in
Surface Science
volume
418
issue
2
pages
9 pages
publisher
Elsevier
external identifiers
  • Scopus:0032488147
ISSN
0039-6028
language
English
LU publication?
yes
id
13284f75-7be0-4133-b190-9608443cc566
date added to LUP
2016-04-27 16:46:34
date last changed
2016-07-01 13:56:50
@misc{13284f75-7be0-4133-b190-9608443cc566,
  abstract     = {<p>The influence of preadsorbed oxygen on the CO adsorption properties of a laterally heterogeneous bimetallic surface consisting of Pd islands on Rh(111) at a Pd coverage of 0.5 monolayers has been studied by high resolution core level photoemission. A surface consisting of clean Pd islands surrounded by oxygen-covered Rh(111) patches was prepared by predosing oxygen at room temperature. By applying core level photoemission to the Pd 3d<sub>5/2</sub> and the C 1s levels, the adsorption of CO on this surface was studied with particular attention being paid to possible CO diffusion between the two surface parts. The CO molecules are found to diffuse from the oxygen-covered Rh(111) patches onto the Pd islands for low to medium CO exposures. This diffusion direction is opposite of that found previously for the 0.5 ML Pd on Rh(111) system with no oxygen predosing. This reversal of the diffusion direction is argued to be due to a large reduction of the CO adsorption energy on the Rh patches of the surface caused by the preadsorbed oxygen. © 1998 Elsevier Science B.V. All rights reserved.</p>},
  author       = {Beutler, A. and Sandell, A. and Jaworowski, A. J. and Wiklund, M. and Nyholm, R. and Andersen, J. N.},
  issn         = {0039-6028},
  keyword      = {Adsorption kinetics,Carbon monoxide,Chemisorption,Oxygen,Palladium,Rhodium,Single crystal surfaces,Surface diffusion,Synchrotron radiation photoelectron spectroscopy},
  language     = {eng},
  month        = {12},
  number       = {2},
  pages        = {457--465},
  publisher    = {ARRAY(0x86b94e8)},
  series       = {Surface Science},
  title        = {The influence of preadsorbed oxygen on the adsorption of CO on two-dimensional Pd islands on a Rh (111) surface},
  volume       = {418},
  year         = {1998},
}