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The Role of Oxides in Catalytic CO Oxidation over Rhodium and Palladium

Gustafson, Johan LU ; Balmes, Olivier LU ; Zhang, Chu LU ; Shipilin, Mikhail LU ; Schaefer, Andreas LU ; Hagman, Benjamin LU ; Merte, Lindsay R. LU ; Martin, Natalia M. LU ; Carlsson, Per Anders and Jankowski, Maciej, et al. (2018) In ACS Catalysis 8(5). p.4438-4445
Abstract

Catalytic CO oxidation is a seemingly simple reaction between CO and O2 molecules, one of the reactions in automotive catalytic converters, and the fruit-fly reaction in model catalysis. Surprisingly, the phase responsible for the catalytic activity is still under debate, despite decades of investigations. We have performed a simple but yet conclusive study of single crystal Rh and Pd model catalysts, resolving this controversy. For Rh, the oxygen-covered metallic surface is more active than the oxide, while for Pd, thin oxide films are at least as active as the metallic surface, but a thicker oxide is less active. Apart from resolving a long-standing debate, our results pinpoint important design principles for oxidation... (More)

Catalytic CO oxidation is a seemingly simple reaction between CO and O2 molecules, one of the reactions in automotive catalytic converters, and the fruit-fly reaction in model catalysis. Surprisingly, the phase responsible for the catalytic activity is still under debate, despite decades of investigations. We have performed a simple but yet conclusive study of single crystal Rh and Pd model catalysts, resolving this controversy. For Rh, the oxygen-covered metallic surface is more active than the oxide, while for Pd, thin oxide films are at least as active as the metallic surface, but a thicker oxide is less active. Apart from resolving a long-standing debate, our results pinpoint important design principles for oxidation catalysts as to prevent catalytic extinction at high oxygen exposures.

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type
Contribution to journal
publication status
published
subject
keywords
active phase, CO oxidation, oxidation catalysis, oxide, palladium, rhodium, surface oxide
in
ACS Catalysis
volume
8
issue
5
pages
8 pages
publisher
The American Chemical Society
external identifiers
  • scopus:85046619013
ISSN
2155-5435
DOI
10.1021/acscatal.8b00498
language
English
LU publication?
yes
id
3351ed81-7f5a-4eef-b895-5186ef2dcb4b
date added to LUP
2018-05-24 13:23:36
date last changed
2018-09-23 04:57:40
@article{3351ed81-7f5a-4eef-b895-5186ef2dcb4b,
  abstract     = {<p>Catalytic CO oxidation is a seemingly simple reaction between CO and O<sub>2</sub> molecules, one of the reactions in automotive catalytic converters, and the fruit-fly reaction in model catalysis. Surprisingly, the phase responsible for the catalytic activity is still under debate, despite decades of investigations. We have performed a simple but yet conclusive study of single crystal Rh and Pd model catalysts, resolving this controversy. For Rh, the oxygen-covered metallic surface is more active than the oxide, while for Pd, thin oxide films are at least as active as the metallic surface, but a thicker oxide is less active. Apart from resolving a long-standing debate, our results pinpoint important design principles for oxidation catalysts as to prevent catalytic extinction at high oxygen exposures.</p>},
  author       = {Gustafson, Johan and Balmes, Olivier and Zhang, Chu and Shipilin, Mikhail and Schaefer, Andreas and Hagman, Benjamin and Merte, Lindsay R. and Martin, Natalia M. and Carlsson, Per Anders and Jankowski, Maciej and Crumlin, Ethan J. and Lundgren, Edvin},
  issn         = {2155-5435},
  keyword      = {active phase,CO oxidation,oxidation catalysis,oxide,palladium,rhodium,surface oxide},
  language     = {eng},
  month        = {05},
  number       = {5},
  pages        = {4438--4445},
  publisher    = {The American Chemical Society},
  series       = {ACS Catalysis},
  title        = {The Role of Oxides in Catalytic CO Oxidation over Rhodium and Palladium},
  url          = {http://dx.doi.org/10.1021/acscatal.8b00498},
  volume       = {8},
  year         = {2018},
}