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Pt/CeO2 and Pt/CeSnOx Catalysts for Low-Temperature CO Oxidation Prepared by Plasma-Arc Technique Full article

Journal Frontiers in Chemistry
ISSN: 2296-2646
Output data Year: 2019, Volume: 7, Article number : 114, Pages count : 17 DOI: 10.3389/fchem.2019.00114
Tags platinum, ceria, tin, CO oxidation, plasma arc synthesis, DFT calculations, Pt/CeO2 catalyst
Authors Kardash Tatyana Y. 1,2 , Derevyannikova Elizaveta A. 1 , Slavinskaya Elena M. 1,2 , Stadnichenko Andrey I. 1,2 , Maltsev Vasiliy A. 3 , Zaikovskii Alexey V. 3 , Novopashin Sergey A. 3 , Boronin Andrei I. 1,2 , Neyman Konstantin M. 4,5,6
Affiliations
1 Boreskov Institute of Catalysis, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
2 Novosibirsk State University, Novosibirsk, Russia
3 Kutateladze Institute of Thermophysics, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
4 Departament de Ciència dels Materials i Química Física, Universitat de Barcelona, Barcelona, Spain
5 Institut de Química Teòrica i Computacional, Universitat de Barcelona, Barcelona, Spain
6 ICREA (Institució Catalana de Recerca i Estudis Avançats), Barcelona, Spain

Funding (7)

1 Federal Agency for Scientific Organizations 0303-2016-0003
2 Russian Foundation for Basic Research 17-03-00754
3 Russian Foundation for Basic Research 17-43-540738
4 Ministry of Education and Vocational Training PRX17/00348
5 Ministry of Economic Affairs and Digital Transformation CTQ2015-64618-R
6 Ministry of Economic Affairs and Digital Transformation MDM-2017-0767
7 Government of Catalonia 2017SGR13

Abstract: We applied a method of plasma arc synthesis to study effects of modification of the fluorite phase of ceria by tin ions. By sputtering active components (Pt, Ce, Sn) together with carbon from a graphite electrode in a helium ambient we prepared samples of complex highly defective composite PtCeC and PtCeSnC oxide particles stabilized in a matrix of carbon. Subsequent high-temperature annealing of the samples in oxygen removes the carbon matrix and causes the formation of active catalysts Pt/CeOx and Pt/CeSnOx for CO oxidation. In the presence of Sn, X-Ray Diffraction (XRD) and High-Resolution Transmission Electron Microscopy (HRTEM) show formation of a mixed phase CeSnOx and stabilization of more dispersed species with a fluorite-type structure. These factors are essential for the observed high activity and thermic stability of the catalyst modified by Sn. X-Ray Photoelectron Spectroscopy (XPS) reveals the presence of both Pt2+ and Pt4+ ions in the catalyst Pt/CeOx, whereas only the state Pt2+ of platinum could be detected in the Sn-modified catalyst Pt/CeSnOx. Insertion of Sn ions into the Pt/CeOx lattice destabilizes/reduces Pt4+ cations in the Pt/CeSnOx catalyst and induces formation of strikingly high concentration (up to 50% at.) of lattice Ce3+ ions. Our DFT calculations corroborate destabilization of Pt4+ ions by incorporation of cationic Sn in Pt/CeOx. The presented results show that modification of the fluorite lattice of ceria by tin induces substantial amount of mobile reactive oxygen partly due to affecting geometric parameters of ceria by tin ions.
Cite: Kardash T.Y. , Derevyannikova E.A. , Slavinskaya E.M. , Stadnichenko A.I. , Maltsev V.A. , Zaikovskii A.V. , Novopashin S.A. , Boronin A.I. , Neyman K.M.
Pt/CeO2 and Pt/CeSnOx Catalysts for Low-Temperature CO Oxidation Prepared by Plasma-Arc Technique
Frontiers in Chemistry. 2019. V.7. 114 :1-17. DOI: 10.3389/fchem.2019.00114 WOS Scopus РИНЦ ANCAN PMID OpenAlex
Files: Full text from publisher
Dates:
Submitted: Nov 26, 2018
Accepted: Feb 13, 2019
Published print: Mar 12, 2019
Published online: Mar 12, 2019
Identifiers:
Web of science: WOS:000460954500001
Scopus: 2-s2.0-85064616810
Elibrary: 38673189
Chemical Abstracts: 2019:1375033
Chemical Abstracts (print): 176:91025
PMID: 30931295
OpenAlex: W2920957730
Citing:
DB Citing
Web of science 23
Scopus 23
Elibrary 20
OpenAlex 26
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