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Cerium oxide catalysts for oxidative coupling of methane reaction: effect of lithium, samarium and lanthanum dopants

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

Απλή Εγγραφή

URIhttp://purl.tuc.gr/dl/dias/B4F2A553-9296-48BA-91C6-03542707BFBD-
Αναγνωριστικόhttps://doi.org/10.1016/j.jece.2022.107259-
Αναγνωριστικόhttps://www.sciencedirect.com/science/article/pii/S2213343722001324-
Γλώσσαen-
Μέγεθος14 pagesen
ΤίτλοςCerium oxide catalysts for oxidative coupling of methane reaction: effect of lithium, samarium and lanthanum dopantsen
ΔημιουργόςSiakavelas Georgios I.en
ΔημιουργόςCharisiou Nikolaos D.en
ΔημιουργόςAlkhoori Ayeshaen
ΔημιουργόςSebastian Victoren
ΔημιουργόςHinder Steven Johnen
ΔημιουργόςBaker Marken
ΔημιουργόςGentekakis Ioannisen
ΔημιουργόςΓεντεκακης Ιωαννηςel
ΔημιουργόςPolychronopoulou Kyriakien
ΔημιουργόςGoula Maria A.en
ΕκδότηςElsevieren
ΠεριγραφήNDC, IVY and MAG are grateful for financial support from the European Union and Greek national funds through the operational program Competitiveness, Entrepreneurship and Innovation, under the call Research-Create-Innovate (Project code: T1EDK-00782). GIS is grateful for financial support by Greece and ESF through the Operational Programme "Human Resources Development, Education and Lifelong Learning" in the context of the project “Strengthening Human Resources Research Potential via Doctorate Research” (MIS-5000432), implemented by the State Scholarships Foundation (ΙΚΥ).el
ΠερίληψηThe work presented herein reports on the oxidative coupling of methane (OCM) performance of a series of Li-free and Li-doped CeO2 and CeO2 modified with Sm3+ and La3+ catalysts. The supporting materials (Ce, Sm-Ce and La-Sm-Ce metal oxides) were synthesized using the microwave assisted sol-gel method in order to achieve nanophase complex materials with increased particle surface energy and reactivity. Lithium ions were added, using the wet impregnation technique, in order to further improve the physicochemical characteristics and reinforce the activity and selectivity, in terms of C2H6 and C2H4 production. All materials were characterized using N2 adsorption-desorption, XRD, Raman spectroscopy, CO2-TPD, H2-TPR, SEM and XPS. We showed that the addition of lithium species changed the reaction pathway and drastically enhanced the production of ethylene and ethane, mainly for the promoted catalysts (Li/Sm-Ce and Li/La-Sm-Ce). In particular, the presence and the synergy between the electrophilic oxygen species (peroxide and superoxide), population of oxygen vacancy sites and the surface moderate basic sites determined the reaction pathway and the desirable product distribution.en
ΤύποςPeer-Reviewed Journal Publicationen
ΤύποςΔημοσίευση σε Περιοδικό με Κριτέςel
Άδεια Χρήσηςhttp://creativecommons.org/licenses/by/4.0/en
Ημερομηνία2024-02-02-
Ημερομηνία Δημοσίευσης2022-
Θεματική ΚατηγορίαOxidative coupling of methaneen
Θεματική ΚατηγορίαCerium-doped catalystsen
Θεματική ΚατηγορίαTrivalent ionsen
Θεματική ΚατηγορίαElectrophilic oxygen speciesen
Θεματική ΚατηγορίαC2 productionen
Βιβλιογραφική ΑναφοράG.I. Siakavelas, N. D. Charisiou, A. AlKhoori, V. Sebastian, S. J. Hinder, M. A. Baker, I. V. Yentekakis, K. Polychronopoulou, and M. A. Goula, “Cerium oxide catalysts for oxidative coupling of methane reaction: effect of lithium, samarium and lanthanum dopants,” J. Environ. Chem. Eng., vol. 10, no. 2, Apr. 2022, doi: 10.1016/j.jece.2022.107259.en

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