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Mechanism of CO oxidation reaction on O-covered Pd(111) surfaces studied with fast x-ray photoelectron spectroscopy: Change of reaction path accompanying phase transition of O domains

Nakai, I ; Kondoh, H ; Shimada, T ; Resta, Andrea LU ; Andersen, Jesper N LU and Ohta, T (2006) In Journal of Chemical Physics 124(22).
Abstract
We studied the mechanism of CO oxidation on O-precovered Pd(111) surfaces by means of fast x-ray photoelectron spectroscopy (XPS). The oxygen overlayer is compressed upon CO coadsorption from a p(2x2) structure into a (root 3x root 3)R30 degrees structure and then into a p(2x1) structure with increasing CO coverage. These three O phases exhibit distinctly different reactivities. (1) The p(2x2) phase does not react with CO unless the surface temperature is sufficiently high (< 290 K). (2) In the (root 3x root 3)R30 degrees phase, the reaction occurs exclusively at island peripheries. CO molecules in a high-density phase formed under CO exposure react with oxygen atoms, leading to quite a small apparent activation energy. (3) The reaction... (More)
We studied the mechanism of CO oxidation on O-precovered Pd(111) surfaces by means of fast x-ray photoelectron spectroscopy (XPS). The oxygen overlayer is compressed upon CO coadsorption from a p(2x2) structure into a (root 3x root 3)R30 degrees structure and then into a p(2x1) structure with increasing CO coverage. These three O phases exhibit distinctly different reactivities. (1) The p(2x2) phase does not react with CO unless the surface temperature is sufficiently high (< 290 K). (2) In the (root 3x root 3)R30 degrees phase, the reaction occurs exclusively at island peripheries. CO molecules in a high-density phase formed under CO exposure react with oxygen atoms, leading to quite a small apparent activation energy. (3) The reaction proceeds uniformly over the islands in the p(2x1) phase. (Less)
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author
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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Chemical Physics
volume
124
issue
22
article number
224712
publisher
American Institute of Physics (AIP)
external identifiers
  • wos:000238279800054
  • scopus:33745124351
ISSN
0021-9606
DOI
10.1063/1.2205856
language
English
LU publication?
yes
id
22545e81-5d66-4e07-b2fc-5850ed58745f (old id 406034)
date added to LUP
2016-04-01 12:34:57
date last changed
2021-02-17 01:33:02
@article{22545e81-5d66-4e07-b2fc-5850ed58745f,
  abstract     = {We studied the mechanism of CO oxidation on O-precovered Pd(111) surfaces by means of fast x-ray photoelectron spectroscopy (XPS). The oxygen overlayer is compressed upon CO coadsorption from a p(2x2) structure into a (root 3x root 3)R30 degrees structure and then into a p(2x1) structure with increasing CO coverage. These three O phases exhibit distinctly different reactivities. (1) The p(2x2) phase does not react with CO unless the surface temperature is sufficiently high (&lt; 290 K). (2) In the (root 3x root 3)R30 degrees phase, the reaction occurs exclusively at island peripheries. CO molecules in a high-density phase formed under CO exposure react with oxygen atoms, leading to quite a small apparent activation energy. (3) The reaction proceeds uniformly over the islands in the p(2x1) phase.},
  author       = {Nakai, I and Kondoh, H and Shimada, T and Resta, Andrea and Andersen, Jesper N and Ohta, T},
  issn         = {0021-9606},
  language     = {eng},
  number       = {22},
  publisher    = {American Institute of Physics (AIP)},
  series       = {Journal of Chemical Physics},
  title        = {Mechanism of CO oxidation reaction on O-covered Pd(111) surfaces studied with fast x-ray photoelectron spectroscopy: Change of reaction path accompanying phase transition of O domains},
  url          = {http://dx.doi.org/10.1063/1.2205856},
  doi          = {10.1063/1.2205856},
  volume       = {124},
  year         = {2006},
}