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Effect of cobalt loading on the solid state properties and ethyl acetate oxidation performance of cobalt-cerium mixed oxides

Konsolakis Michail, Carabineiro, Sónia Alexandra Correia, Marnellos, Geōrgios E, Asad Muhammad Faizan, Soares Olívia Salomé Gonçalves Pinto, Pereira Manuel Fernando R., De Melo Órfão José J., Figueiredo José Luís

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URIhttp://purl.tuc.gr/dl/dias/02206163-9B2E-4B96-A596-32A81795258D-
Identifierhttps://www.sciencedirect.com/science/article/pii/S0021979717301686?via%3Dihub-
Identifierhttps://doi.org/10.1016/j.jcis.2017.02.014-
Languageen-
Extent9 pagesen
TitleEffect of cobalt loading on the solid state properties and ethyl acetate oxidation performance of cobalt-cerium mixed oxidesen
CreatorKonsolakis Michailen
CreatorΚονσολακης Μιχαηλel
CreatorCarabineiro, Sónia Alexandra Correiaen
CreatorMarnellos, Geōrgios Een
CreatorAsad Muhammad Faizanen
CreatorSoares Olívia Salomé Gonçalves Pintoen
CreatorPereira Manuel Fernando R.en
CreatorDe Melo Órfão José J.en
CreatorFigueiredo José Luísen
PublisherElsevieren
Content SummaryCobalt-cerium mixed oxides were prepared by the wet impregnation method and evaluated for volatile organic compounds (VOCs) abatement, using ethyl acetate (EtAc) as model molecule. The impact of Co content on the physicochemical characteristics of catalysts and EtAc conversion was investigated. The materials were characterized by various techniques, including N2 adsorption at −196 °C, scanning electron microscopy (SEM), X-ray diffraction (XRD), H2-temperature programmed reduction (H2-TPR) and X-ray photoelectron spectroscopy (XPS) to reveal the structure–activity relationship. The obtained results showed the superiority of mixed oxides compared to bare CeO2 and Co3O4, demonstrating a synergistic effect. The optimum oxidation performance was achieved with the sample containing 20 wt.% Co (Co/Ce atomic ratio of ca. 0.75), in which complete conversion of EtAc was attained at 260 °C. In contrast, temperatures above 300 °C were required to achieve 100% conversion over the single oxides. Notably, a strong relationship between both the: (i) relative population, and (ii) facile reduction of lattice oxygen with the ethyl acetate oxidation activity was found, highlighting the key role of loosely bound oxygen species on VOCs oxidation. A synergistic Co-Ce interaction can be accounted for the enhanced reducibility of mixed oxides, linked with the increased mobility of lattice oxygen.en
Type of ItemPeer-Reviewed Journal Publicationen
Type of ItemΔημοσίευση σε Περιοδικό με Κριτέςel
Licensehttp://creativecommons.org/licenses/by/4.0/en
Date of Item2018-05-10-
Date of Publication2017-
SubjectCeO2en
SubjectCo3O4en
SubjectCobalt (Co)-based catalystsen
SubjectEthyl acetate oxidationen
SubjectVolatile organic compounds (VOCs)en
Bibliographic CitationM. Konsolakis, S.A.C. Carabineiro, G. E. Marnellos, M. F. Asad, O.S.G.P. Soares, M.F.R. Pereira, J.J.M.b Órfão and J.L. Figueiredo, "Effect of cobalt loading on the solid state properties and ethyl acetate oxidation performance of cobalt-cerium mixed oxides," J. Colloid Interf. Sci., vol. 496, pp. 141-149, Jun. 2017. doi: 10.1016/j.jcis.2017.02.014en

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