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Institutional Repository [SANDBOX]
Technical University of Crete
Technical University of Crete
EN
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| URI | http://purl.tuc.gr/dl/dias/B4F2A553-9296-48BA-91C6-03542707BFBD | - |
| Identifier | https://doi.org/10.1016/j.jece.2022.107259 | - |
| Identifier | https://www.sciencedirect.com/science/article/pii/S2213343722001324 | - |
| Language | en | - |
| Extent | 14 pages | en |
| Title | Cerium oxide catalysts for oxidative coupling of methane reaction: effect of lithium, samarium and lanthanum dopants | en |
| Creator | Siakavelas Georgios I. | en |
| Creator | Charisiou Nikolaos D. | en |
| Creator | Alkhoori Ayesha | en |
| Creator | Sebastian Victor | en |
| Creator | Hinder Steven John | en |
| Creator | Baker Mark | en |
| Creator | Gentekakis Ioannis | en |
| Creator | Γεντεκακης Ιωαννης | el |
| Creator | Polychronopoulou Kyriaki | en |
| Creator | Goula Maria A. | en |
| Publisher | Elsevier | en |
| Description | NDC, 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 |
| Content Summary | The 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 |
| Type of Item | Peer-Reviewed Journal Publication | en |
| Type of Item | Δημοσίευση σε Περιοδικό με Κριτές | el |
| License | http://creativecommons.org/licenses/by/4.0/ | en |
| Date of Item | 2024-02-02 | - |
| Date of Publication | 2022 | - |
| Subject | Oxidative coupling of methane | en |
| Subject | Cerium-doped catalysts | en |
| Subject | Trivalent ions | en |
| Subject | Electrophilic oxygen species | en |
| Subject | C2 production | en |
| Bibliographic Citation | G.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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