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Highly selective and stable Ni/La-M (M=Sm, Pr, and Mg)-CeO2 catalysts for CO2 methanation

Siakavelas Georgios I., Charisiou Nikolaos, Alkhoori Ayesha, AlKhoori Sara I. , Sebastian Victor, Hinder Steven J., Baker Mark A., Gentekakis Ioannis, Polychronopoulou Kyriaki, Goula Maria A.

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URIhttp://purl.tuc.gr/dl/dias/3F69159A-B0E7-4B59-B380-9C20A01D5B5A-
Identifierhttps://doi.org/10.1016/j.jcou.2021.101618-
Identifierhttps://www.sciencedirect.com/science/article/pii/S2212982021001852-
Languageen-
Extent20 pagesen
TitleHighly selective and stable Ni/La-M (M=Sm, Pr, and Mg)-CeO2 catalysts for CO2 methanationen
CreatorSiakavelas Georgios I.en
CreatorCharisiou Nikolaosen
CreatorAlkhoori Ayeshaen
CreatorAlKhoori Sara I. en
CreatorSebastian Victoren
CreatorHinder Steven J.en
CreatorBaker Mark A.en
CreatorGentekakis Ioannisen
CreatorΓεντεκακης Ιωαννηςel
CreatorPolychronopoulou Kyriakien
CreatorGoula Maria A.en
PublisherElsevieren
Content SummaryIn the study presented herein, nickel catalysts supported on CeO2 and, for the first time in the literature, on La2O3-Sm2O3-CeO2, La2O3-Pr2O3-CeO2 and La2O3-MgO-CeO2 were prepared and evaluated for the reaction of CO2 methanation. The carriers were prepared through a sol-gel microwave assisted method and the catalysts were obtained following wet impregnation. The physicochemical properties of the catalysts prior to reaction were determined through H2-TPR, H2-TPD, Raman spectroscopy, XRD, CO2-TPD, N2 physisorption-desorption, XPS and TEM. The spent catalysts, after the time-on-stream experiments were further characterised using TEM and TGA. It was shown that the simultaneous incorporation of La3+, Pr3+ and La3+, Sm3+ into the crystal structure of cerium oxide created higher population of oxygen vacant sites. Moreover, the co-presence of La3+, Mg2+ and La3+, Pr3+ into the CeO2 increased the plethos of moderate basic sites. These physicochemical properties increased the rate of CO2 methanation reaction at relatively low temperatures. Furthermore, it is argued that the addition of La3+ stabilized the Ni active sites via the probable formation of a new compound (La-O-Ni) on the catalyst surface or synergetic catalytic centers at the interfacial area improving the catalytic properties (activity and stability). Finally, the catalytic performance tests revealed that the addition of La3+ mainly improved the conversion of CO2 and yield of CH4 for the Ni/La-Mg-Ce and Ni/La-Sm-Ce samples. The rCO2 and XCO2 values at 300 °C followed the order Ni/La-Sm-Ce >> Ni/La-Mg-Ce > Ni/La-Pr-Ce > Ni/Ce.en
Type of ItemPeer-Reviewed Journal Publicationen
Type of ItemΔημοσίευση σε Περιοδικό με Κριτέςel
Licensehttp://creativecommons.org/licenses/by/4.0/en
Date of Item2023-01-11-
Date of Publication2021-
SubjectCO methanationen
SubjectDoped-ceria supporten
SubjectNickel catalystsen
SubjectOxygen vacant sitesen
SubjectResistance to sinteringen
Bibliographic CitationG. I. Siakavelas, N. D. Charisiou, A. AlKhoori, S. AlKhoori, V. Sebastian, S. J. Hinder, M.A.Baker, I. V. Yentekakis, K. Polychronopoulou, and M. A. Goula, “Highly selective and stable Ni/La-M (M=Sm, Pr, and Mg)-CeO2 catalysts for CO2 methanation,” J. CO2 Util., vol. 51, Sep. 2021, doi: 10.1016/j.jcou.2021.101618.en

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