Repozitorij Univerze v Novi Gorici

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Naslov:Operando XAS analysis of CuO/SiO2 and CuO/CeO2 catalysts
Avtorji:ID Arčon, Iztok, UNG (Avtor)
ID Teržan, Janvit, Kemijski inštitut Ljubljana (Avtor)
ID Djinović, Petar, Kemijski inštitut Ljubljana (Avtor)
ID Zabilsky, Maxim, Kemijski inštitut Ljubljana (Avtor)
ID Pintar, Albin, Kemijski inštitut Ljubljana (Avtor)
Datoteke: Gradivo nima datotek, ki so prostodostopne za javnost. Gradivo je morda fizično dosegljivo v knjižnici fakultete, zalogo lahko preverite v COBISS-u. Povezava se odpre v novem oknu
Jezik:Angleški jezik
Vrsta gradiva:Delo ni kategorizirano
Tipologija:1.12 - Objavljeni povzetek znanstvenega prispevka na konferenci
Organizacija:UNG - Univerza v Novi Gorici
Opis:The possibilities of the operando XAS analysis of catalysts will be presented on two case studies of promising new catalytic materials: alkali doped nano-dispersed copper oxide clusters on ordered mesoporous SiO2, which is highly active and selective towards propylene epoxidation [1], and nanoshaped CuO/CeO2 catalysts used in N2O decomposition reaction [2]. Operando Cu K-edge and Ce L3-edge XANES and EXAFS analysis was performed during catalytic reactions under controlled reaction conditions in a tubular reactor filled with protective He atmosphere at 1 bar. The spectra were measured before the reaction at RT, then during heating, and during catalytic reaction at 400 °C under controlled atmosphere. Operando XANES analysis is used to monitor the changes in valence states and local symmetries of Cu and Ce cations in the catalysts. A partial reduction of Cu2+ to Cu+ and Cu0 and Ce4+ to Ce3+ species was detected during catalyst activation, and re-oxidation during catalytic reaction. Different dynamics of reaching a quasi-steady oxidation state were revealed as the tested catalysts approached the quasi-steady state after 300 min of reaction. Operando EXAFS spectra are used to precisely determine local structure of Cu and Ce cations, to identify structural characteristics and changes of Cu and Ce species during the catalytic reactions. In this way, the active site in the catalytic reactions can be identified and the mechanism of the reaction clarified. The results of operando XAS analyses are crucial to guide further material modification, to obtain more effective catalyst, and material which is more resistant to inhibiting effects that cause catalyst deactivation during catalytic reaction.
Ključne besede:katalizatorji, Cu XANES, EXAFS
Leto izida:2018
Št. strani:1
PID:20.500.12556/RUNG-4069-8b7a3b25-9cad-42e8-f256-bad3683b58bf Novo okno
COBISS.SI-ID:5219835 Novo okno
NUK URN:URN:SI:UNG:REP:F7QCUZKZ
Datum objave v RUNG:12.09.2018
Število ogledov:4939
Število prenosov:0
Metapodatki:XML DC-XML DC-RDF
:
ARČON, Iztok, TERŽAN, Janvit, DJINOVIĆ, Petar, ZABILSKY, Maxim in PINTAR, Albin, 2018, Operando XAS analysis of CuO/SiO2 and CuO/CeO2 catalysts. V : Book of abstracts, European Conference on X-Ray Spectrometry - EXRS-2018 [na spletu]. Objavljeni povzetek znanstvenega prispevka na konferenci. Ljubljana. 2018. [Dostopano 4 april 2025]. Pridobljeno s: https://repozitorij.ung.si/IzpisGradiva.php?lang=slv&id=4069
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Gradivo je del monografije

Naslov:Book of abstracts, European Conference on X-Ray Spectrometry - EXRS-2018
Uredniki:Matjaž Kavčič
Kraj izida:Ljubljana
Založnik:Inštitut Jožef Stefan
Leto izida:2018
ISBN:978-961-264-126-9
Prireditelj konference:Inštitut Jožef Stefan

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