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Naslov:Insight into the interdependence of Ni and Al in bifunctional Ni/ZSM-5 catalysts at the nanoscale
Avtorji:Vu, Hue-Tong (Avtor)
Arčon, Iztok (Avtor)
Oliveira de Souza, Danilo (Avtor)
Pollastri, Simone (Avtor)
Dražić, Goran (Avtor)
Volavšek, Janez (Avtor)
Mali, Gregor (Avtor)
Zabukovec Logar, Nataša (Avtor)
Novak Tušar, Nataša (Avtor)
Datoteke:.pdf Hue_Tong_Vu_-_Iztok_Arcon_-_et_al_-__Nanoscale_Advances_2022.pdf (1,25 MB)
 
URL http://repozitorij.ung.si/admin/Datoteka.php?id=24156
 
Jezik:Angleški jezik
Vrsta gradiva:Neznano ()
Tipologija:1.01 - Izvirni znanstveni članek
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. 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.
Ključne besede:Ni/ZSM-5 catalysts, zeolite, Ni XANES, EXAFS
Leto izida:2022
Št. strani:str. 1–11
Številčenje:iss. , Vol.
COBISS_ID:107406339 Povezava se odpre v novem oknu
UDK:53
ISSN pri članku:2516-0230
URN:URN:SI:UNG:REP:KOVZZVGE
DOI:10.1039/d2na00102k Povezava se odpre v novem oknu
Licenca:CC BY 4.0
To delo je dosegljivo pod licenco Creative Commons Priznanje avtorstva 4.0 Mednarodna
Število ogledov:105
Število prenosov:2
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Gradivo je del revije

Naslov:Nanoscale advances
Založnik:Royal Society of Chemistry
ISSN:2516-0230
COBISS.SI-ID:529765145 Novo okno

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