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Title:Insight into the interdependence of Ni and Al in bifunctional Ni/ZSM-5 catalysts at the nanoscale
Authors:ID Vu, Hue-Tong (Author)
ID Arčon, Iztok (Author)
ID Oliveira de Souza, Danilo (Author)
ID Pollastri, Simone (Author)
ID Dražić, Goran (Author)
ID Volavšek, Janez (Author)
ID Mali, Gregor (Author)
ID Zabukovec Logar, Nataša (Author)
ID Novak Tušar, Nataša (Author)
Files:.pdf Hue_Tong_Vu_-_Iztok_Arcon_-_et_al_-__Nanoscale_Advances_2022.pdf (1,25 MB)
MD5: B3C95AD8173A10196CFC134C1B2B3286
Work type:Unknown
Typology:1.01 - Original Scientific Article
Organization:UNG - University of Nova Gorica
Abstract: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. 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 using Ni K-edge XANES and EXAFS analyses, complemented by XRD and TEM, to resolve 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. Ni species in Ni/ZSM-5 exist as NiO crystals (3–50 nm) 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 ¼ 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.
Keywords:Ni/ZSM-5 catalysts, zeolite, Ni XANES, EXAFS
Year of publishing:2022
Number of pages:str. 1–11
Numbering:Vol. , iss.
PID:20.500.12556/RUNG-7332 New window
COBISS.SI-ID:107406339 New window
ISSN on article:2516-0230
DOI:10.1039/d2na00102k New window
Publication date in RUNG:11.05.2022
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Record is a part of a journal

Title:Nanoscale advances
Publisher:Royal Society of Chemistry
COBISS.SI-ID:529765145 New window


License:CC BY 4.0, Creative Commons Attribution 4.0 International
Description:This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.
Licensing start date:11.05.2022