Journal
ACS CATALYSIS
Volume 8, Issue 5, Pages 4438-4445Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.8b00498
Keywords
CO oxidation; palladium; rhodium; oxide; surface oxide; oxidation catalysis; active phase
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Funding
- Swedish Research Council
- Swedish Foundation for Strategic Research
- Crafoord Foundation
- Knut and Alice Wallenberg Foundation
- DOE Office of Science User Facility [DE-AC02-05CH11231]
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Catalytic CO oxidation is a seemingly simple reaction between CO and O-2 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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