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Title:XAS analysis of bifunctional Ni/ZSM-5 catalysts
Authors:ID Arčon, Iztok (Author)
ID Vu, Hue-Tong (Author)
ID Dražić, Goran (Author)
ID Volavšek, Janez (Author)
ID Mali, Gregor (Author)
ID Zabukovec Logar, Nataša (Author)
ID Novak Tušar, Nataša (Author)
Files:URL https://exrs2024.demokritos.gr/programme/
Description: dostopno z geslom
 
Language:English
Work type:Unknown
Typology:1.12 - Published Scientific Conference Contribution Abstract
Organization:UNG - University of Nova Gorica
Abstract: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.
Keywords:Ni EXAFS, XANES Ni/ZSM-5 catalyst
Publication status:Published
Publication version:Version of Record
Year of publishing:2024
Number of pages:Str. 35
PID:20.500.12556/RUNG-9181-38694527-9d18-75ce-fd95-c5f62f11be9c New window
COBISS.SI-ID:200920067 New window
UDC:53
NUK URN:URN:SI:UNG:REP:Z0VYVTVR
Publication date in RUNG:05.07.2024
Views:1468
Downloads:4
Metadata:XML DC-XML DC-RDF
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ARČON, Iztok, VU, Hue-Tong, DRAŽIĆ, Goran, VOLAVŠEK, Janez, MALI, Gregor, ZABUKOVEC LOGAR, Nataša and NOVAK TUŠAR, Nataša, 2024, XAS analysis of bifunctional Ni/ZSM-5 catalysts. In : European Conference on X-ray Spectrometry 2024, EXRS 2024 [online]. Published Scientific Conference Contribution Abstract. Agia Paraskevi. 2024. [Accessed 14 April 2025]. Retrieved from: https://exrs2024.demokritos.gr/programme/
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Record is a part of a monograph

Title:European Conference on X-ray Spectrometry 2024, EXRS 2024 : 24-28 June 2024, Athens, Greece
Place of publishing:[Agia Paraskevi]
Publisher:Institute of Nuclear and Particle Physics, National Centre For Scientific Research “Demokritos”
Year of publishing:2024
COBISS.SI-ID:200919299 New window

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