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Steam reforming of iso-octane toward hydrogen production over mono- and bi-metallic Cu–Co/CeO2 catalysts: Structure-activity correlations

Al-Musa A.A., Ioakeimidis Zisis S., Al- Saleh M.S., Al-Zahrany A., Marnellos Giorgos E., Konsolakis Michail

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URIhttp://purl.tuc.gr/dl/dias/467DE97E-1593-426A-BB2B-E947AA331B08-
Identifierhttps://doi.org/10.1016/j.ijhydene.2014.09.107-
Languageen-
Extent13en
TitleSteam reforming of iso-octane toward hydrogen production over mono- and bi-metallic Cu–Co/CeO2 catalysts: Structure-activity correlationsen
Creator Al-Musa A.A.en
Creator Ioakeimidis Zisis S.en
Creator Al- Saleh M.S.en
Creator Al-Zahrany A.en
Creator Marnellos Giorgos E.en
CreatorKonsolakis Michailen
CreatorΚονσολακης Μιχαηλel
PublisherElsevieren
DescriptionΔημοσίευση σε επιστημονικό περιοδικό el
Content SummaryΤhe feasibility of tailoring the iso-octane steam reforming activity of Cu/CeO2 catalysts through the use of Co as a second active metal (Cu20−xCox, where x = 0, 5, 10, 15, 20 wt%), is investigated. Characterization studies, involving N2 adsorption–desorption at −196 °C (BET), X-ray diffraction (XRD), Scanning Electron Microscopy (SEM), X-ray Photoelectron Spectroscopy (XPS) and Temperature Programmed Reduction (H2-TPR), were carried out to reveal the impact of the morphological, structural and surface properties of the catalysts on the reforming performance. The results showed that reforming activity was monotonically increased upon increasing cobalt loading. The Co/CeO2 catalyst demonstrated the optimum performance with a H2 yield of 70–80% in the 600–800 °C temperature interval. The Co/CeO2 catalyst exhibited also excellent stability at temperatures above 700 °C, while Cu-based catalysts rapidly deactivated in long term stability tests. A close correlation between surface/redox properties and steam reforming efficiency was established. The lower reducibility of Co/CeO2 catalysts, associated with the formation of Co3+ species, in Co3O4-like phase, can be accounted for the enhanced carbon tolerance of Co-based catalysts. Furthermore, the high concentration of surface oxygen species on Co/CeO2 catalysts can be considered for their enhanced performance. On the other hand, the Cu-induced easier reducibility of bimetallic catalysts, in conjunction with carbon deposition and active phase sintering can be accounted for their inferior steam reforming performance. Irreversible changes in the redox properties of Cu-based catalysts, taking place under reaction conditions, could be resulted to ceria deactivation thus hindering the redox process to keep onen
Type of ItemPeer-Reviewed Journal Publicationen
Type of ItemΔημοσίευση σε Περιοδικό με Κριτέςel
Licensehttp://creativecommons.org/licenses/by/4.0/en
Date of Item2015-11-04-
Date of Publication2014-
SubjectIso-octaneen
SubjectSteam reformingen
SubjectHydrogen productionen
Bibliographic CitationA.A. Al-Musa, Z.S. Ioakeimidis, M.S. Al- Saleh, A. Al-Zahrany, G.E. Marnellos, M. Konsolakis, "Steam reforming of iso-octane toward hydrogen production over mono- and bi-metallic Cu–Co/CeO2 catalysts: Structure-activity correlations," International Journal of Hydrogen Energy, vol. 39, no. 34, pp. 19541–19554, Nov. 2014. doi: 10.1016/j.ijhydene.2014.09.107en

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