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Naslov:XAS analysis of bifunctional Ni/ZSM-5 catalysts
Avtorji:ID Arčon, Iztok (Avtor)
ID Vu, Hue-Tong (Avtor)
ID Dražić, Goran (Avtor)
ID Volavšek, Janez (Avtor)
ID Mali, Gregor (Avtor)
ID Zabukovec Logar, Nataša (Avtor)
ID Novak Tušar, Nataša (Avtor)
Datoteke:URL https://exrs2024.demokritos.gr/programme/
Opis: dostopno z geslom
 
Jezik:Angleški jezik
Vrsta gradiva:Neznano
Tipologija:1.12 - Objavljeni povzetek znanstvenega prispevka na konferenci
Organizacija:UNG - Univerza v Novi Gorici
Opis:In a bifunctional Ni/ZSM-5 zeolite type catalyst, catalytic properties are usually tuned via varying Al and Ni contents [1]. Here we present a systematic structural study of the Ni/ZSM-5 materials by Ni K-edge XANES and EXAFS analyses, to monitor the changes of local structure and chemical state of Ni species in the catalysts as a function of Al and Ni content. A series of Ni/ZSM-5 type zeolites with different Al to Si and Ni to Si molar ratios were synthesized by a “green”, template free technique [2]. With a combination of XAS, XRD and TEM we resolved the changes in the local environment of Ni species induced by the different Al contents in the Ni/ZSM-5 catalysts. Ni species in Ni/ZSM-5 exist as NiO nanocrystals and as charge compensating Ni2+ cations. The Ni K-edge XANES and EXAFS results enabled the quantification of Ni-containing species. At a low Al to Si ratio (nAl/nSi < 0.04), the NiO nanoparticles predominate in the samples and account for over 65% of Ni phases. However, NiO is outnumbered by Ni2+ cations attached to the zeolite framework in ZSM-5 with a high Al to Si ratio (nAl/nSi = 0.05) due to a higher number of framework negative charges imparted by Al. The obtained results show that the number of highly reducible and active NiO nanocrystals is strongly correlated with the framework Al sites present in Ni/ZSM-5 zeolites.
Ključne besede:Ni EXAFS, XANES Ni/ZSM-5 catalyst
Status publikacije:Objavljeno
Verzija publikacije:Objavljena publikacija
Leto izida:2024
Št. strani:Str. 35
PID:20.500.12556/RUNG-9181-38694527-9d18-75ce-fd95-c5f62f11be9c Novo okno
COBISS.SI-ID:200920067 Novo okno
UDK:53
NUK URN:URN:SI:UNG:REP:Z0VYVTVR
Datum objave v RUNG:05.07.2024
Število ogledov:238
Število prenosov:1
Metapodatki:XML RDF-CHPDL DC-XML DC-RDF
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Skupna ocena:(0 glasov)
Vaša ocena:Ocenjevanje je dovoljeno samo prijavljenim uporabnikom.
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Gradivo je del monografije

Naslov:European Conference on X-ray Spectrometry 2024, EXRS 2024 : 24-28 June 2024, Athens, Greece
Kraj izida:[Agia Paraskevi]
Založnik:Institute of Nuclear and Particle Physics, National Centre For Scientific Research “Demokritos”
Leto izida:2024
COBISS.SI-ID:200919299 Novo okno

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