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Co2 hydrogenation over nanoceria-supported transition metal catalysts: Role of ceria morphology (nanorods versus nanocubes) and active phase nature (co versus cu)

Konsolakis Michail, Lykaki Maria, Stefa Sofia, Carabineiro, Sónia Alexandra Correia, Varvoutis Georgios, Papista E., Marnellos, Geōrgios E

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URIhttp://purl.tuc.gr/dl/dias/6D6794BD-0B50-4D17-80EA-A7C2588CBF1C-
Identifierhttps://doi.org/10.3390/nano9121739-
Identifierhttps://www.mdpi.com/2079-4991/9/12/1739-
Languageen-
Extent21 pagesen
TitleCo2 hydrogenation over nanoceria-supported transition metal catalysts: Role of ceria morphology (nanorods versus nanocubes) and active phase nature (co versus cu)en
CreatorKonsolakis Michailen
CreatorΚονσολακης Μιχαηλel
CreatorLykaki Mariaen
CreatorΛυκακη Μαριαel
CreatorStefa Sofiaen
CreatorΣτεφα Σοφιαel
CreatorCarabineiro, Sónia Alexandra Correiaen
CreatorVarvoutis Georgiosen
CreatorPapista E.en
CreatorMarnellos, Geōrgios Een
PublisherMDPIen
Content SummaryIn this work we report on the combined impact of active phase nature (M: Co or Cu) and ceria nanoparticles support morphology (nanorods (NR) or nanocubes (NC)) on the physicochemical characteristics and CO2 hydrogenation performance of M/CeO2 composites at atmospheric pressure. It was found that CO2 conversion followed the order: Co/CeO2 > Cu/CeO2 > CeO2, independently of the support morphology. Co/CeO2 catalysts demonstrated the highest CO2 conversion (92% at 450◦ C), accompanied by 93% CH4 selectivity. On the other hand, Cu/CeO2 samples were very selective for CO production, exhibiting 52% CO2 conversion and 95% CO selectivity at 380◦ C. The results obtained in a wide range of H2:CO2 ratios (1–9) and temperatures (200–500◦ C) are reaching in both cases the corresponding thermodynamic equilibrium conversions, revealing the superiority of Co-and Cu-based samples in methanation and reverse water-gas shift (rWGS) reactions, respectively. Moreover, samples supported on ceria nanocubes exhibited higher specific activity (µmol CO2·m−2·s−1 ) compared to samples of rod-like shape, disclosing the significant role of support morphology, besides that of metal nature (Co or Cu). Results are interpreted on the basis of different textural and redox properties of as-prepared samples in conjunction to the different impact of metal entity (Co or Cu) on CO2 hydrogenation process.en
Type of ItemPeer-Reviewed Journal Publicationen
Type of ItemΔημοσίευση σε Περιοδικό με Κριτέςel
Licensehttp://creativecommons.org/licenses/by/4.0/en
Date of Item2020-04-03-
Date of Publication2019-
SubjectCO2 hydrogenationen
SubjectCobalten
SubjectCopperen
SubjectMethanation (Sabatier) reactionen
SubjectNanoceriaen
SubjectReverse water-gas shift reactionen
Bibliographic CitationM. Konsolakis, M. Lykaki, S. Stefa, S.A.C. Carabineiro, G. Varvoutis, E. Papista and G.E. Marnellos, "Co2 hydrogenation over nanoceria-supported transition metal catalysts: Role of ceria morphology (nanorods versus nanocubes) and active phase nature (co versus cu)," Nanomaterials, vol. 9, no. 12, Dec. 2019. doi: 10.3390/nano9121739en

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