Non-oxidative Decomposition of CH4 Over CeO2 and CeO2–SiO2 Supported Bimetallic Ni–Mo Catalysts

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

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Bibliographic Details
Published in:Catalysis letters 2022-09, Vol.152 (9), p.2789-2800
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:
Bimetals
Catalysis
Catalysts
Catalytic activity
Cerium oxides
Chemistry
Chemistry and Materials Science
Decomposition
Decomposition reactions
Durability
Graphitization
Hydrogen production
Industrial Chemistry/Chemical Engineering
Methane
Molybdates
Molybdenum
Multi wall carbon nanotubes
Nickel compounds
Organometallic Chemistry
Physical Chemistry
Raman spectroscopy
Silicon dioxide
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Summary:The development of highly active and durable catalysts for H 2 production through CH 4 decomposition process is still a great challenge. In this study, CeO 2 and CeO 2 –SiO 2 supported bimetallic Ni–Mo catalysts were produced and examined for CH 4 decomposition at 700 °C. The unreacted and reacted catalytic materials were characterized by XRD, BET, H 2 -TPR, TGA-DTA, TEM, and Raman spectroscopy techniques. The collected data illustrated that the inclusion of SiO 2 to CeO 2 support in Ni–Mo/CeO 2 –SiO 2 catalyst participated in the inhibition of the catalytic efficiency because of the fast agglomeration of Ni particles on the SiO 2 surface, that arise from the weak interactions between the metal and support. The Ni–Mo/CeO 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 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 2 and Ni–Mo/CeO 2 –SiO 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 2 and CeO 2 –SiO 2 supported Ni–Mo catalysts exhibited good crystallinity and high graphitization degree. Graphical Abstract
ISSN:1011-372X
1572-879X
DOI:10.1007/s10562-021-03844-w