Reduced Carbon Monoxide Saturation Coverage on Vicinal Palladium Surfaces: The Importance of the Adsorption Site
Artikel i vetenskaplig tidskrift, 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.
Författare
Fernando Garcia-Martinez
Consejo Superior de Investigaciones Científicas (CSIC)
Elisabeth Dietze
Chalmers, Fysik, Kemisk fysik
F. Schiller
Consejo Superior de Investigaciones Científicas (CSIC)
Dorotea Gajdek
Malmö universitet
L. R. Merte
Lunds universitet
Malmö universitet
Sabrina M. Gericke
Lunds universitet
Johan Zetterberg
Lunds universitet
Stefano Albertin
Lunds universitet
Edvin Lundgren
Lunds universitet
Henrik Grönbeck
Chalmers, Fysik, Kemisk fysik
J. E. Ortega
Donostia International Physics Center
Universidad del Pais Vasco / Euskal Herriko Unibertsitatea
Consejo Superior de Investigaciones Científicas (CSIC)
Journal of Physical Chemistry Letters
1948-7185 (eISSN)
Vol. 12 39 9508-9515Ämneskategorier (SSIF 2011)
Oorganisk kemi
Fysikalisk kemi
Materialkemi
Styrkeområden
Materialvetenskap
DOI
10.1021/acs.jpclett.1c02639
PubMed
34559547