NAP-XPS and in Situ DRIFTS of the Interaction of CO with Au Nanoparticles Supported by Ce1- xEuxO2 Nanocubes

Bezkrovnyi OS, Blaumeiser D, Vorokhta M, Kraszkiewicz P, Pawlyta M, Bauer T, Libuda J, Kepinski L (2020)

Publication Type: Journal article

Publication year: 2020

Journal

Journal of Physical Chemistry C American Chemical Society

Book Volume: 124

Pages Range: 5647-5656

Journal Issue: 10

DOI: 10.1021/acs.jpcc.9b10142

Abstract

Control of metal-support interactions is one of the major challenges in heterogeneous catalysis. In this study, we explored the effect of Eu doping on the metal-support interactions in Au/Ce1-xEuxO2 catalysts applied in the oxidation of CO. We probe the catalysts with CO under realistic conditions by near-ambient-pressure X-ray photoelectron spectroscopy (NAP-XPS) and in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). NAP-XPS allows in situ investigation of the surface reducibility of the ceria support and charging of the Au nanoparticles. Both parameters are crucial, as they are responsible for the efficiency of Au/ceria catalysts in the CO oxidation. We found that doping of the ceria support with Eu decreases the reducibility of Ce4+ in the Au/Ce1-xEuxO2 system and the population of Auδ+ sites. We identified the available CO adsorption sites on Au/ceria (Auδ-, Au0, and Auδ+) in the typical temperature window of the CO oxidation reaction by in situ DRIFTS. We found that the difference in the catalytic activity of Au/CeO2 and Au/Ce0.80Eu0.20O2 does not origin from an electronic effect of the Eu dopant or different adsorption sites but from the size of the Au nanoparticles. The most active Au nanoparticles are very small, reactive Au nanoparticles, which are exclusively present on the undoped ceria support.

Authors with CRIS profile

Dominik Blaumeiser Lehrstuhl für Katalytische Grenzflächenforschung Tanja Retzer Lehrstuhl für Katalytische Grenzflächenforschung Jörg Libuda Lehrstuhl für Katalytische Grenzflächenforschung

Involved external institutions

Institute of Low Temperature and Structural Research (INTiBS) PL Poland (PL) Univerzita Karlova v Praze / Charles University in Prague CZ Czech Republic (CZ) Silesian University of Technology Gliwice PL Poland (PL)

How to cite

APA:

Bezkrovnyi, O.S., Blaumeiser, D., Vorokhta, M., Kraszkiewicz, P., Pawlyta, M., Bauer, T.,... Kepinski, L. (2020). NAP-XPS and in Situ DRIFTS of the Interaction of CO with Au Nanoparticles Supported by Ce1- xEuxO2 Nanocubes. Journal of Physical Chemistry C, 124(10), 5647-5656. https://dx.doi.org/10.1021/acs.jpcc.9b10142

MLA:

Bezkrovnyi, O. S., et al. "NAP-XPS and in Situ DRIFTS of the Interaction of CO with Au Nanoparticles Supported by Ce1- xEuxO2 Nanocubes." Journal of Physical Chemistry C 124.10 (2020): 5647-5656.

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