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Bezkrovnyi O, Bruix A, Blaumeiser D, Piliai L, Schötz S, Bauer T, Khalakhan I, Skála T, Matvija P, Kraszkiewicz P, Pawlyta M, Vorokhta M, Matolínová I, Libuda J, Neyman KM, Kȩpiński L. Metal-Support Interaction and Charge Distribution in Ceria-Supported Au Particles Exposed to CO. CHEMISTRY OF MATERIALS : A PUBLICATION OF THE AMERICAN CHEMICAL SOCIETY 2022; 34:7916-7936. [PMID: 36117879 PMCID: PMC9476549 DOI: 10.1021/acs.chemmater.2c01659] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/02/2022] [Revised: 07/18/2022] [Indexed: 06/15/2023]
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 Auδ- 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.
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Affiliation(s)
- Oleksii Bezkrovnyi
- W.
Trzebiatowski Institute of Low Temperature and Structure Research, Polish Academy of Sciences, 50-422 Wroclaw, Poland
| | - Albert Bruix
- Departament
de Ciència de Materials i Química Física and
Institut de Química Teòrica i Computacional (IQTCUB), Universitat de Barcelona, 08028 Barcelona, Spain
| | - Dominik Blaumeiser
- Interface
Research and Catalysis, Erlangen Center for Interface Research and
Catalysis, Friedrich-Alexander Universität
Erlangen-Nürnberg, Egerlandstraße 3, 91058 Erlangen, Germany
| | - Lesia Piliai
- Department
of Surface and Plasma Science, Faculty of Mathematics and Physics, Charles University, V Holešovičkách 2, 18000, Prague 8, Czech Republic
| | - Simon Schötz
- Interface
Research and Catalysis, Erlangen Center for Interface Research and
Catalysis, Friedrich-Alexander Universität
Erlangen-Nürnberg, Egerlandstraße 3, 91058 Erlangen, Germany
| | - Tanja Bauer
- Interface
Research and Catalysis, Erlangen Center for Interface Research and
Catalysis, Friedrich-Alexander Universität
Erlangen-Nürnberg, Egerlandstraße 3, 91058 Erlangen, Germany
| | - Ivan Khalakhan
- Department
of Surface and Plasma Science, Faculty of Mathematics and Physics, Charles University, V Holešovičkách 2, 18000, Prague 8, Czech Republic
| | - Tomáš Skála
- Department
of Surface and Plasma Science, Faculty of Mathematics and Physics, Charles University, V Holešovičkách 2, 18000, Prague 8, Czech Republic
| | - Peter Matvija
- Department
of Surface and Plasma Science, Faculty of Mathematics and Physics, Charles University, V Holešovičkách 2, 18000, Prague 8, Czech Republic
| | - Piotr Kraszkiewicz
- W.
Trzebiatowski Institute of Low Temperature and Structure Research, Polish Academy of Sciences, 50-422 Wroclaw, Poland
| | - Mirosława Pawlyta
- Materials
Research Laboratory, Silesian University
of Technology, Gliwice 44-100, Poland
| | - Mykhailo Vorokhta
- Department
of Surface and Plasma Science, Faculty of Mathematics and Physics, Charles University, V Holešovičkách 2, 18000, Prague 8, Czech Republic
| | - Iva Matolínová
- Department
of Surface and Plasma Science, Faculty of Mathematics and Physics, Charles University, V Holešovičkách 2, 18000, Prague 8, Czech Republic
| | - Jörg Libuda
- Interface
Research and Catalysis, Erlangen Center for Interface Research and
Catalysis, Friedrich-Alexander Universität
Erlangen-Nürnberg, Egerlandstraße 3, 91058 Erlangen, Germany
| | - Konstantin M. Neyman
- Departament
de Ciència de Materials i Química Física and
Institut de Química Teòrica i Computacional (IQTCUB), Universitat de Barcelona, 08028 Barcelona, Spain
- ICREA
(Institució Catalana de Recerca i Estudis Avançats), 08010 Barcelona, Spain
| | - Leszek Kȩpiński
- W.
Trzebiatowski Institute of Low Temperature and Structure Research, Polish Academy of Sciences, 50-422 Wroclaw, Poland
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Woźniak P, Małecka MA, Kraszkiewicz P, Miśta W, Bezkrovnyi O, Chinchilla L, Trasobares S. Confinement of nano-gold in 3D hierarchically structured gadolinium-doped ceria mesocrystal: synergistic effect of chemical composition and structural hierarchy in CO and propane oxidation. Catal Sci Technol 2022. [DOI: 10.1039/d2cy01214f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Gadolinium-doped ceria hierarchical gold catalyst shows four-fold TOF increase compared to undoped non-hierarchical system, proving the synergistic effect of doping and structural hierarchy in propane oxidation.
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Affiliation(s)
- Piotr Woźniak
- Institute of Low Temperature and Structure Research, Polish Academy of Sciences, P.O. Box 1410, 50-950 Wrocław 2, Poland
| | - Małgorzata A. Małecka
- Institute of Low Temperature and Structure Research, Polish Academy of Sciences, P.O. Box 1410, 50-950 Wrocław 2, Poland
| | - Piotr Kraszkiewicz
- Institute of Low Temperature and Structure Research, Polish Academy of Sciences, P.O. Box 1410, 50-950 Wrocław 2, Poland
| | - Włodzimierz Miśta
- Institute of Low Temperature and Structure Research, Polish Academy of Sciences, P.O. Box 1410, 50-950 Wrocław 2, Poland
| | - Oleksii Bezkrovnyi
- Institute of Low Temperature and Structure Research, Polish Academy of Sciences, P.O. Box 1410, 50-950 Wrocław 2, Poland
| | - Lidia Chinchilla
- Departamento de Ciencia de los Materiales e Ing. Metalúrgica y Química Inorgánica, Universidad de Cádiz, Campus Universitario de Puerto Real, 11510, Cádiz, Spain
| | - Susana Trasobares
- Departamento de Ciencia de los Materiales e Ing. Metalúrgica y Química Inorgánica, Universidad de Cádiz, Campus Universitario de Puerto Real, 11510, Cádiz, Spain
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Woźniak P, Kraszkiewicz P, Małecka MA. Hierarchical Au/CeO 2 systems – influence of Ln 3+ dopants on the catalytic activity in the propane oxidation process. CrystEngComm 2022. [DOI: 10.1039/d2ce00827k] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The catalytic activity of the hierarchical tube-like Au/Ce1−xLnxO2−x/2 in the propane oxidation process depends not only on the presence of Au nanoparticles on the support surface but also on the type of deformation in the CeO2 network.
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Affiliation(s)
- Piotr Woźniak
- Institute of Low Temperature and Structure Research, Polish Academy of Sciences, P.O. Box 1410, Okólna 2, 50-422 Wrocław, Poland
| | - Piotr Kraszkiewicz
- Institute of Low Temperature and Structure Research, Polish Academy of Sciences, P.O. Box 1410, Okólna 2, 50-422 Wrocław, Poland
| | - Małgorzata A. Małecka
- Institute of Low Temperature and Structure Research, Polish Academy of Sciences, P.O. Box 1410, Okólna 2, 50-422 Wrocław, Poland
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