Reduced Carbon Monoxide Saturation Coverage on Vicinal Palladium Surfaces: The Importance of the Adsorption Site
Journal article, 2021
Steps at metal surfaces may influence energetics and kinetics of catalytic reactions in unexpected ways. Here, we report a significant reduction of the CO saturation coverage in Pd vicinal surfaces, which in turn is relevant for the light-off of the CO oxidation reaction. The study is based on a systematic investigation of CO adsorption on vicinal Pd(111) surfaces making use of a curved Pd crystal. A combined X-ray Photoelectron Spectroscopy and DFT analysis allows us to demonstrate that an entire row of atomic sites under Pd steps remains free of CO upon saturation at 300 K, leading to a step-density-dependent reduction of CO coverage that correlates with the observed decrease of the light-off temperature during CO oxidation in vicinal Pd surfaces.
Author
Fernando Garcia-Martinez
Spanish National Research Council (CSIC)
Elisabeth Dietze
Chalmers, Physics, Chemical Physics
F. Schiller
Spanish National Research Council (CSIC)
Dorotea Gajdek
Malmö university
L. R. Merte
Lund University
Malmö university
Sabrina M. Gericke
Lund University
Johan Zetterberg
Lund University
Stefano Albertin
Lund University
Edvin Lundgren
Lund University
Henrik Grönbeck
Chalmers, Physics, Chemical Physics
J. E. Ortega
Donostia International Physics Center
University of the Basque Country (UPV/EHU)
Spanish National Research Council (CSIC)
Journal of Physical Chemistry Letters
1948-7185 (eISSN)
Vol. 12 39 9508-9515Subject Categories (SSIF 2011)
Inorganic Chemistry
Physical Chemistry
Materials Chemistry
Areas of Advance
Materials Science
DOI
10.1021/acs.jpclett.1c02639
PubMed
34559547