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

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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 catalysts as to prevent catalytic extinction at high oxygen exposures.

Detaljer

Författare
Enheter & grupper
Externa organisationer
  • Stockholms universitet
  • Chalmers University of Technology
  • European Synchrotron Radiation Facility
  • Lawrence Berkeley National Laboratory
Forskningsområden

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Fysikalisk kemi

Nyckelord

Originalspråkengelska
Sidor (från-till)4438-4445
Antal sidor8
TidskriftACS Catalysis
Volym8
Utgivningsnummer5
StatusPublished - 2018 maj 4
PublikationskategoriForskning
Peer review utfördJa