Reduced Carbon Monoxide Saturation Coverage on Vicinal Palladium Surfaces: the Importance of the Adsorption Site

[Image: see text] 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...

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Detalles Bibliográficos
Autores principales: Garcia-Martinez, Fernando, Dietze, Elisabeth, Schiller, Frederik, Gajdek, Dorotea, Merte, Lindsay R., Gericke, Sabrina M., Zetterberg, Johan, Albertin, Stefano, Lundgren, Edvin, Grönbeck, Henrik, Ortega, J. Enrique
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2021
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8503880/
https://www.ncbi.nlm.nih.gov/pubmed/34559547
http://dx.doi.org/10.1021/acs.jpclett.1c02639
Descripción
Sumario:[Image: see text] 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.

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