Non-oxidative Decomposition of CH.sub.4 Over CeO.sub.2 and CeO.sub.2-SiO.sub.2 Supported Bimetallic Ni-Mo Catalysts

The development of highly active and durable catalysts for H.sub.2 production through CH.sub.4 decomposition process is still a great challenge. In this study, CeO.sub.2 and CeO.sub.2-SiO.sub.2 supported bimetallic Ni-Mo catalysts were produced and examined for CH.sub.4 decomposition at 700 °C. The...

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Bibliographic Details
Published in:Catalysis letters 2022-09, Vol.152 (9), p.2789
Main Authors: Ahmed, Hanan A, Awadallah, Ahmed E, Aboul-Enein, Ateyya A, Solyman, Sanaa M, Aboul-Gheit, Noha A. K
Format: Article
Language:English
Subjects:
Catalysts
Hydrogen
Production processes
Raman spectroscopy
Online Access:Get full text
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Summary:The development of highly active and durable catalysts for H.sub.2 production through CH.sub.4 decomposition process is still a great challenge. In this study, CeO.sub.2 and CeO.sub.2-SiO.sub.2 supported bimetallic Ni-Mo catalysts were produced and examined for CH.sub.4 decomposition at 700 °C. The unreacted and reacted catalytic materials were characterized by XRD, BET, H.sub.2-TPR, TGA-DTA, TEM, and Raman spectroscopy techniques. The collected data illustrated that the inclusion of SiO.sub.2 to CeO.sub.2 support in Ni-Mo/CeO.sub.2-SiO.sub.2 catalyst participated in the inhibition of the catalytic efficiency because of the fast agglomeration of Ni particles on the SiO.sub.2 surface, that arise from the weak interactions between the metal and support. The Ni-Mo/CeO.sub.2 catalyst displayed an exceptional catalytic decomposition behavior and durability stemming from the facile formation of a solid Ni-O-Ce solution with a fair interaction in terms of metal-support and the presence of some NiMoO.sub.4 species. These phases improved the dispersion and stability of the active Ni particles, resulting in improved catalytic activity. The hydrogen yield was 48% and 29% after 180 min of reaction over Ni-Mo/CeO.sub.2 and Ni-Mo/CeO.sub.2-SiO.sub.2 catalysts, respectively. Multi-walled carbon nanotubes of diverse radii were produced on the surface of both reacted catalysts depending on the catalyst structure and composition. TGA and Raman results showed that the as-deposited MWCNTs over both CeO.sub.2 and CeO.sub.2-SiO.sub.2 supported Ni-Mo catalysts exhibited good crystallinity and high graphitization degree.
ISSN:1011-372X
DOI:10.1007/s10562-021-03844-w