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Deciphering the role of Ni particle size and nickel-ceria interfacial perimeter in the low-temperature CO2 methanation reaction over remarkably active Ni/CeO2 nanorods

Varvoutis Georgios, Lykaki Maria, Stefa Sofia, Binas Vassilios, Marnellos, George, 19..-, Konsolakis Michail

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URIhttp://purl.tuc.gr/dl/dias/3A87F9E4-BA3C-4894-B68E-B102B404E550-
Identifierhttps://doi.org/10.1016/j.apcatb.2021.120401-
Identifierhttps://www.sciencedirect.com/science/article/pii/S0926337321005270-
Languageen-
Extent14 pagesen
TitleDeciphering the role of Ni particle size and nickel-ceria interfacial perimeter in the low-temperature CO2 methanation reaction over remarkably active Ni/CeO2 nanorodsen
CreatorVarvoutis Georgiosen
CreatorLykaki Mariaen
CreatorΛυκακη Μαριαel
CreatorStefa Sofiaen
CreatorΣτεφα Σοφιαel
CreatorBinas Vassiliosen
CreatorMarnellos, George, 19..-en
CreatorKonsolakis Michailen
CreatorΚονσολακης Μιχαηλel
PublisherElsevieren
Content SummaryThe structure sensitivity of CO2 methanation was explored over nickel particles (10–25 nm) supported on CeO2 nanorods. An optimum Ni particle size of 20 nm was revealed, with the corresponding sample demonstrating remarkable activity, i.e., 187 μmol CH4 g−1 s−1 and 92 % CH4 yield at 275 °C, which is among the highest ever reported. Notably, the intrinsic activity on the basis of the exposed Ni sites or Ni-ceria perimeter is largely independent of the Ni size, showcasing that neither the exposed Ni sites nor the Ni-ceria interface can be employed as activity descriptors. A compromise between the length of the metal-support perimeter and the competitive presence of larger Ni particles is necessary for the optimum activity. On the grounds of a structure-sensitivity analysis, the superior activity of larger Ni particles could be attributed to the presence of under-coordinated step and kink sites, instead of largely inactive terrace sites.en
Type of ItemPeer-Reviewed Journal Publicationen
Type of ItemΔημοσίευση σε Περιοδικό με Κριτέςel
Licensehttp://creativecommons.org/licenses/by/4.0/en
Date of Item2022-08-26-
Date of Publication2021-
SubjectCO2 methanationen
SubjectNi catalystsen
SubjectCeO2 nanorodsen
SubjectParticle size effecten
SubjectStructure-sensitivityen
Bibliographic CitationG. Varvoutis, M. Lykaki, S. Stefa, V. Binas, G. E. Marnellos, and M. Konsolakis, “Deciphering the role of Ni particle size and nickel-ceria interfacial perimeter in the low-temperature CO2 methanation reaction over remarkably active Ni/CeO2 nanorods,” Appl. Catal., B, vol. 297, Nov. 2021, doi: 10.1016/j.apcatb.2021.120401.en

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