Probing the redox capacity of Pt-CeO2 model catalyst for low-temperature CO oxidation
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F23%3A10468335" target="_blank" >RIV/00216208:11320/23:10468335 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=WurNqES-Pg" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=WurNqES-Pg</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1039/d3ta02507a" target="_blank" >10.1039/d3ta02507a</a>
Alternative languages
Result language
angličtina
Original language name
Probing the redox capacity of Pt-CeO2 model catalyst for low-temperature CO oxidation
Original language description
The redox capacity of Pt-CeO2 catalysts for low-temperature CO oxidation has been investigated by means of near-ambient pressure X-ray photoelectron spectroscopy, synchrotron radiation photoelectron spectroscopy, and resonant photoemission spectroscopy. The well-defined model Pt-CeO2 systems containing specific Pt species which differ with respect to the oxidation state, chemical environment, and nuclearity, including atomically dispersed Pt2+ and Pt4+ species, metallic Pt-0 nanoparticles, ultra-small Pt* aggregates, and PtOx clusters were prepared by physical vapor co-deposition of Pt and Ce metals in an oxygen atmosphere onto a CeO2(111) buffer layer on Ru(0001) and subsequent annealing under reducing or oxidizing conditions. The oxidation states of Pt species and Ce cations were monitored upon CO exposure as a function of temperature. We found that metallic Pt-0 nanoparticles, ultra-small Pt*/PtOx clusters, and Pt4+ species serve as CO adsorption sites at low temperature. Exclusively, the redox capacity for the low-temperature CO oxidation (below the room temperature) was observed only for the Pt-CeO2 catalyst containing metallic Pt-0 nanoparticles. The corresponding redox pathway is associated with CO spillover and the formation of bidentate carbonate species. Above 400 K, the redox interaction of CO with model Pt-CeO2 catalysts involves the Mars-van Krevelen mechanism regardless of the nature of the Pt species.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10305 - Fluids and plasma physics (including surface physics)
Result continuities
Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2023
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Journal of Materials Chemistry A
ISSN
2050-7488
e-ISSN
2050-7496
Volume of the periodical
11
Issue of the periodical within the volume
31
Country of publishing house
GB - UNITED KINGDOM
Number of pages
12
Pages from-to
16659-16670
UT code for WoS article
001025117500001
EID of the result in the Scopus database
2-s2.0-85165510030