Metal-Support Interaction and Charge Distribution in Ceria-Supported Au Particles Exposed to CO

Bezkrovnyi O, Bruix A, Blaumeiser D, Piliai L, Schötz S, Bauer T, Khalakhan I, Skala T, Matvija P, Kraszkiewicz P, Pawlyta M, Vorokhta M, Matolinova I, Libuda J, Neyman KM, Ke Pinski L (2022)

Publication Type: Journal article

Publication year: 2022

Journal

DOI: 10.1021/acs.chemmater.2c01659

Abstract

Understanding how reaction conditions affect metal-support interactions in catalytic materials is one of the most challenging tasks in heterogeneous catalysis research. Metal nanoparticles and their supports often undergo changes in structure and oxidation state when exposed to reactants, hindering a straightforward understanding of the structure-activity relations using only ex situ or ultrahigh vacuum techniques. Overcoming these limitations, we explored the metal-support interaction between gold nanoparticles and ceria supports in ultrahigh vacuum and after exposure to CO. A combination of in situ methods (on powder and model Au/CeO2 samples) and theoretical calculations was applied to investigate the gold/ceria interface and its reactivity toward CO exposure. X-ray photoelectron spectroscopy measurements rationalized by first-principles calculations reveal a distinctly inhomogeneous charge distribution, with Au+ atoms in contact with the ceria substrate and neutral Au0 atoms at the surface of the Au nanoparticles. Exposure to CO partially reduces the ceria substrate, leading to electron transfer to the supported Au nanoparticles. Transferred electrons can delocalize among the neutral Au atoms of the particle or contribute to forming inert Au- atoms near oxygen vacancies at the ceria surface. This charge redistribution is consistent with the evolution of the vibrational frequencies of CO adsorbed on Au particles obtained using diffuse reflectance infrared Fourier transform spectroscopy.

Authors with CRIS profile

Involved external institutions

Polska Akademia Nauk (PAN) / Polish Academy of Sciences Poland (PL) Universitat de Barcelona (UB) / University of Barcelona Spain (ES) Univerzita Karlova v Praze / Charles University in Prague Czech Republic (CZ) Silesian University of Technology Gliwice Poland (PL)

How to cite

APA:

Bezkrovnyi, O., Bruix, A., Blaumeiser, D., Piliai, L., Schötz, S., Bauer, T.,... Ke Pinski, L. (2022). Metal-Support Interaction and Charge Distribution in Ceria-Supported Au Particles Exposed to CO. Chemistry of Materials. https://doi.org/10.1021/acs.chemmater.2c01659

MLA:

Bezkrovnyi, Oleksii, et al. "Metal-Support Interaction and Charge Distribution in Ceria-Supported Au Particles Exposed to CO." Chemistry of Materials (2022).

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