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Reversible formation of a PdCx phase in Pd nanoparticles upon CO and O-2 exposure

Balmes, Olivier; Resta, Andrea; Wermeille, Didier; Felici, Roberto; Messing, Maria LU ; Deppert, Knut LU ; Liu, Zhi; Grass, Michael E.; Bluhm, Hendrik and van Rijn, Richard, et al. (2012) In Physical Chemistry Chemical Physics 14(14). p.4796-4801
Abstract
The structure and chemical composition of Pd nanoparticles exposed to pure CO and mixtures of CO and O-2 at elevated temperatures have been studied in situ by a combination of X-ray Diffraction and X-ray Photoelectron Spectroscopy in pressures ranging from ultra high vacuum to 10 mbar and from room temperature to a few hundred degrees celsius. Our investigation shows that under CO exposure, above a certain temperature, carbon dissolves into the Pd particles forming a carbide phase. Upon exposure to CO and O-2 mixtures, the carbide phase forms and disappears reversibly, switching at the stoichiometric ratio for CO oxidation. This finding opens new scenarios for the understanding of catalytic oxidation of C-based molecules.
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organization
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type
Contribution to journal
publication status
published
subject
in
Physical Chemistry Chemical Physics
volume
14
issue
14
pages
4796 - 4801
publisher
Royal Society of Chemistry
external identifiers
  • wos:000301494400015
  • scopus:84858626058
ISSN
1463-9084
DOI
10.1039/c2cp22873d
language
English
LU publication?
yes
id
ce3baf11-8808-4094-abab-fc5faca86e21 (old id 2594698)
date added to LUP
2012-06-01 14:50:01
date last changed
2017-08-06 04:07:25
@article{ce3baf11-8808-4094-abab-fc5faca86e21,
  abstract     = {The structure and chemical composition of Pd nanoparticles exposed to pure CO and mixtures of CO and O-2 at elevated temperatures have been studied in situ by a combination of X-ray Diffraction and X-ray Photoelectron Spectroscopy in pressures ranging from ultra high vacuum to 10 mbar and from room temperature to a few hundred degrees celsius. Our investigation shows that under CO exposure, above a certain temperature, carbon dissolves into the Pd particles forming a carbide phase. Upon exposure to CO and O-2 mixtures, the carbide phase forms and disappears reversibly, switching at the stoichiometric ratio for CO oxidation. This finding opens new scenarios for the understanding of catalytic oxidation of C-based molecules.},
  author       = {Balmes, Olivier and Resta, Andrea and Wermeille, Didier and Felici, Roberto and Messing, Maria and Deppert, Knut and Liu, Zhi and Grass, Michael E. and Bluhm, Hendrik and van Rijn, Richard and Frenken, Joost W. M. and Westerstroem, Rasmus and Blomberg, Sara and Gustafson, Johan and Andersen, Jesper N and Lundgren, Edvin},
  issn         = {1463-9084},
  language     = {eng},
  number       = {14},
  pages        = {4796--4801},
  publisher    = {Royal Society of Chemistry},
  series       = {Physical Chemistry Chemical Physics},
  title        = {Reversible formation of a PdCx phase in Pd nanoparticles upon CO and O-2 exposure},
  url          = {http://dx.doi.org/10.1039/c2cp22873d},
  volume       = {14},
  year         = {2012},
}