The Role of Oxides in Catalytic CO Oxidation over Rhodium and Palladium
Journal article, 2018
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 oxidefilms 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.
active phase
palladium
rhodium
oxidation catalysis
CO oxidation
oxide
surface oxide
Author
Gustafson Johan
Lund University
Olivier Balmes
MAX IV Laboratory
Chu Zhang
Lund University
Mikhail Shipilin
Stockholm University
Andreas Schaefer
Chalmers, Chemistry and Chemical Engineering, Applied Chemistry
Hagman Benjamin
Lund University
Lindsay Merte
Chalmers, Physics, Chemical Physics
MAX IV Laboratory
Natalia Mihaela Martin
Chalmers, Chemistry and Chemical Engineering, Applied Chemistry
Per-Anders Carlsson
Chalmers, Chemistry and Chemical Engineering, Applied Chemistry
Jankowski Maciej
European Synchrotron Radiation Facility (ESRF)
Ethan J. Crumlin
Lawrence Berkeley National Laboratory
Lundgren Edvin
Lund University
ACS Catalysis
21555435 (eISSN)
Vol. 8 5 4438-4445Synergistic development of X-ray techniques and applicable thin oxides for sustainable chemistry
Swedish Research Council (VR) (2017-06709), 2018-04-04 -- 2021-12-31.
Time-resolved in situ methods for design of catalytic sites within sustainable chemistry
Swedish Research Council (VR) (2013-567), 2013-01-01 -- 2016-12-31.
Driving Forces
Sustainable development
Areas of Advance
Transport
Energy
Materials Science
Subject Categories
Materials Chemistry
Condensed Matter Physics
DOI
10.1021/acscatal.8b00498