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Naslov:Insight into the interdependence of Ni and Al in bifunctional Ni/ZSM-5 catalysts by Ni K-edge XAS analysis
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://feza2023.org/en/
Opis: Dostop z geslom
 
URL https://feza2023.org/en/.
 
Jezik:Angleški jezik
Vrsta gradiva:Neznano
Tipologija:1.12 - Objavljeni povzetek znanstvenega prispevka na konferenci
Organizacija:UNG - Univerza v Novi Gorici
Opis:Catalyst design is crucial for improving catalytic activity and product selectivity. In a bifunctional Ni/ZSM-5 zeolite type catalyst, catalytic properties are usually tuned via varying Al and Ni contents [1]. While changes in acid properties associated with Al sites are usually closely investigated, Ni phases, however, receive inadequate attention. Herein, we present a systematic structural study of Ni in the Ni/ZSM-5 materials by Ni K-edge XANES (X-ray absorption near edge structure) and EXAFS (extended X-ray absorption fine structure) analyses, to monitor the local structure and chemical state of Ni species in the catalysts. In combination with XRD and TEM we resolved the changes in the local environment of Ni species induced by the different Al contents of the parent ZSM-5 prepared by a “green”, template free technique [2]. Ni species in Ni/ZSM-5 exist as NiO crystals (3–50 nm) and as charge compensating Ni2+ cations. The Ni Kedge 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 crystals is strongly correlated with the framework Al sites present in ZSM-5 zeolites, which depend greatly on the synthesis conditions. Therefore, this kind of study is beneficial for any further investigation of the catalytic activities of Ni/ZSM-5 and other metal-modified bifunctional catalysts.
Ključne besede:Ni/ZSM-5 catalysts, Ni EXAFS, XANES
Leto izida:2023
Št. strani:1 str.
PID:20.500.12556/RUNG-8439-d40c387c-56f9-fe84-9167-c15a8e5e4858 Novo okno
COBISS.SI-ID:164972291 Novo okno
UDK:54
NUK URN:URN:SI:UNG:REP:N4DKWQAX
Datum objave v RUNG:19.09.2023
Število ogledov:2255
Število prenosov:7
Metapodatki:XML DC-XML DC-RDF
:
ARČON, Iztok, VU, Hue-Tong, DRAŽIĆ, Goran, VOLAVŠEK, Janez, MALI, Gregor, ZABUKOVEC LOGAR, Nataša in NOVAK TUŠAR, Nataša, 2023, Insight into the interdependence of Ni and Al in bifunctional Ni/ZSM-5 catalysts by Ni K-edge XAS analysis. V : FEZA 2023 [na spletu]. Objavljeni povzetek znanstvenega prispevka na konferenci. S. l. 2023. [Dostopano 5 april 2025]. Pridobljeno s: https://feza2023.org/en/.
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Gradivo je del monografije

Naslov:FEZA 2023 : 9th Conference of the Federation of the European Zeolite Associations, portorž-Portorose Slovenija, 2-6 July 2023
Uredniki:Nataša Zabukovec Logar, Vesna Rakić, Josip Bronić
Kraj izida:[S. l.
Založnik:Slovenian, Croatian and Serbian Zeolite Associations]
Leto izida:2023
COBISS.SI-ID:158641155 Novo okno

Sekundarni jezik

Jezik:Slovenski jezik
Ključne besede:Ni/ZSM-5 catalysts, Ni EXAFS, XANES


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