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Title: Highly-stable Ni–Zn catalyst on USY zeolite support for low temperature methane pyrolysis
Authors: Hamdan, Mohammad
Halawy, Layal
Hijazi, Ayman
Aouad, Samer 
Zeaiter, Joseph
Affiliations: Department of Chemistry 
Keywords: Filamentous carbon
Methane pyrolysis
Ni–Zn catalyst
Issue Date: 2024-04-03
Publisher: Elsevier
Part of: International Journal of Hydrogen Energy
Volume: 61
Start page: 840
End page: 850
Zinc-promoted nickel catalysts on Ultra-Stable Y (USY) zeolite support are tested for their efficacy towards methane pyrolysis. The un-promoted catalyst obtained a conversion of 65.8%, which dropped to 57.3% at the end of the experiment. However, addition of 5 wt% Zn promoter increased the conversion to 67.7%, with no discernible loss in activity after 60 h on-stream. XPS analysis indicated evidence of electronic interaction between the Ni and Zn metals, and the addition of Zn caused a reduction in the metal-support interactions of the catalyst as revealed in TPR and XRD analyses. The catalytic activity of the 50Ni–5Zn/USY also remained completely stable for 60 h even after the operating temperature was increased to 650 °C and the partial pressure of methane in the inlet increased to 80%, at a High gas hour space velocity of 120 L/gcat.h. Analysis of the spent 50Ni–5Zn/USY catalyst revealed the presence of Ni–Zn carbides that may have contributed to the increase in activity, as well as the formation of large quantities of highly graphitic and ordered multi-walled carbon nanotubes produced by the tip-growth mechanism which have been shown to prolong catalyst lifetime on-stream.
ISSN: 03603199
DOI: 10.1016/j.ijhydene.2024.02.370
Ezproxy URL: Link to full text
Type: Journal Article
Appears in Collections:Department of Chemistry

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