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.


Fernando Garcia-Martinez

Centro de Física de Materiales (CSIC-UPV/EHU)

Elisabeth Dietze

Chalmers, Fysik, Kemisk fysik

F. Schiller

Centro de Física de Materiales (CSIC-UPV/EHU)

Dorotea Gajdek

Malmö universitet

L. R. Merte

Malmö universitet

Lunds 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

Universidad del Pais Vasco / Euskal Herriko Unibertsitatea

Centro de Física de Materiales (CSIC-UPV/EHU)

Donostia International Physics Center

Journal of Physical Chemistry Letters

1948-7185 (eISSN)

Vol. 12 39 9508-9515


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