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Faceting of Rhodium(553) in Realistic Reaction Mixtures of Carbon Monoxide and Oxygen

Zhang, Chu LU ; Lundgren, Edvin LU ; Carlsson, P. -A.; Balmes, Olivier LU ; Hellman, A.; Merte, Lindsay LU ; Shipilin, Mikhail LU ; Onderwaater, W. and Gustafson, Johan LU (2015) In Journal of Physical Chemistry C 119(21). p.11646-11652
Abstract
We have investigated the gas composition-dependent faceting of a Rh(553) surface during catalytic CO oxidation under semirealistic reaction conditions using surface X-ray diffraction. We find that under stoichiometric CO and O-2 conditions, the Rh(553) surface maintains its surface orientation without facet formation. In oxygen excess, the CO oxidation reaction becomes mass-transfer limited by the CO diffusion, and the surface is observed to expose (331) or (11 (1) over bar) facets in coexistence with larger (111) terraces. The observed facet formation has previously been observed for pure O-2 exposures of the Rh(553) surface, but at significantly lower O2 partial pressures. Surprisingly, in CO excess, which results in a CO-poisoned... (More)
We have investigated the gas composition-dependent faceting of a Rh(553) surface during catalytic CO oxidation under semirealistic reaction conditions using surface X-ray diffraction. We find that under stoichiometric CO and O-2 conditions, the Rh(553) surface maintains its surface orientation without facet formation. In oxygen excess, the CO oxidation reaction becomes mass-transfer limited by the CO diffusion, and the surface is observed to expose (331) or (11 (1) over bar) facets in coexistence with larger (111) terraces. The observed facet formation has previously been observed for pure O-2 exposures of the Rh(553) surface, but at significantly lower O2 partial pressures. Surprisingly, in CO excess, which results in a CO-poisoned surface with low activity, we instead find coexisting (110) and (111) facets. The reasons for and possible implications of the observed facetings are discussed. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Physical Chemistry C
volume
119
issue
21
pages
11646 - 11652
publisher
The American Chemical Society
external identifiers
  • wos:000355495600042
  • scopus:84930621736
ISSN
1932-7447
DOI
10.1021/acs.jpcc.5b01841
language
English
LU publication?
yes
id
7c34a950-066f-4405-921f-1daca51bdaed (old id 7612591)
date added to LUP
2015-07-21 15:04:51
date last changed
2017-07-02 03:17:52
@article{7c34a950-066f-4405-921f-1daca51bdaed,
  abstract     = {We have investigated the gas composition-dependent faceting of a Rh(553) surface during catalytic CO oxidation under semirealistic reaction conditions using surface X-ray diffraction. We find that under stoichiometric CO and O-2 conditions, the Rh(553) surface maintains its surface orientation without facet formation. In oxygen excess, the CO oxidation reaction becomes mass-transfer limited by the CO diffusion, and the surface is observed to expose (331) or (11 (1) over bar) facets in coexistence with larger (111) terraces. The observed facet formation has previously been observed for pure O-2 exposures of the Rh(553) surface, but at significantly lower O2 partial pressures. Surprisingly, in CO excess, which results in a CO-poisoned surface with low activity, we instead find coexisting (110) and (111) facets. The reasons for and possible implications of the observed facetings are discussed.},
  author       = {Zhang, Chu and Lundgren, Edvin and Carlsson, P. -A. and Balmes, Olivier and Hellman, A. and Merte, Lindsay and Shipilin, Mikhail and Onderwaater, W. and Gustafson, Johan},
  issn         = {1932-7447},
  language     = {eng},
  number       = {21},
  pages        = {11646--11652},
  publisher    = {The American Chemical Society},
  series       = {Journal of Physical Chemistry C},
  title        = {Faceting of Rhodium(553) in Realistic Reaction Mixtures of Carbon Monoxide and Oxygen},
  url          = {http://dx.doi.org/10.1021/acs.jpcc.5b01841},
  volume       = {119},
  year         = {2015},
}