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Nitrous oxide decomposition over Al2O3 supported noble metals (Pt, Pd, Ir): Effect of metal loading and feed composition

Papista Eleni, Iliopoulou Eleni F. , Delimitis Andreas, Goula Grammatiki , Yentekakis Ioannis V., Marnellos George E., Pachatouridou Eleni, Konsolakis Michail

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URIhttp://purl.tuc.gr/dl/dias/F501B78C-BF36-4805-B93B-F1B89C2818C9-
Identifierhttps://doi.org/10.1016/j.jece.2015.03.030-
Languageen-
Extent6en
TitleNitrous oxide decomposition over Al2O3 supported noble metals (Pt, Pd, Ir): Effect of metal loading and feed compositionen
Creator Papista Elenien
Creator Iliopoulou Eleni F. en
Creator Delimitis Andreasen
CreatorGoula Grammatiki en
Creator Yentekakis Ioannis V.en
Creator Marnellos George E.en
CreatorPachatouridou Elenien
CreatorΠαχατουριδου Ελενηel
CreatorKonsolakis Michailen
CreatorΚονσολακης Μιχαηλel
PublisherElsevieren
DescriptionΔημοσίευση σε επιστημονικό περιοδικόel
Content SummaryThe N2O decomposition (de-N2O) performance of Al2O3 supported, low content (0.25, 0.5 and 1.0 wt.%) noble metal (Pt, Pd, Ir) catalysts, is comparatively explored in the present study. The effect of metal content, operation temperature and feed composition on de-N2O performance is investigated. Characterization studies involving BET, XRD, TEM and H2-TPR were also carried out to reveal the impact of metal entity and content on the structural, morphological and redox characteristics of the catalysts. The catalytic results imply that the de-N2O performance is in general increased upon increasing metal loading, a fact being more intense over Ir-based catalysts. Under oxygen deficient conditions, N2O conversions as high as ∼100% and ∼80% are reached at 600 °C over Ir- and Pd-based catalysts, respectively, instead of only ∼30%, achieved over Pt-based catalysts. A moderate degradation in oxygen excess conditions is observed with Ir and Pd catalysts, while Pt-based catalysts are almost fully depressed. The superior de-N2O performance of Ir-, Pd-based catalysts can be mainly interpreted by taking into account the formation of metal oxide phases, not easily susceptible to oxygen poisoning. For Ir-based catalysts the active phase seems to be mainly the metal oxide phase (IrO2), as revealed by H2-TPR, XRD and TEM experiments. In the case of palladium catalysts two different metal phases, i.e. PdO and metallic Pd0 were detected. On the other hand, platinum catalysts presented only metallic Pt0 species, which are prone to poisoning by strongly adsorbed oxygen atoms.en
Type of ItemPeer-Reviewed Journal Publicationen
Type of ItemΔημοσίευση σε Περιοδικό με Κριτέςel
Licensehttp://creativecommons.org/licenses/by/4.0/en
Date of Item2015-11-04-
Date of Publication2015-
SubjectCatalytic N2O decompositionen
SubjectPlatinumen
SubjectPalladiumen
Bibliographic CitationE. Pachatouridou, E. Papista, E.F. Iliopoulou, A. Delimitis, G. Goula, I.V. Yentekakis, G.E. Marnellos and M. Konsolakis, "Nitrous oxide decomposition over Al2O3 supported noble metals (Pt, Pd, Ir): Effect of metal loading and feed composition," Journal of Environmental Chemical Engineering, vol. 3, no. 2, pp. 815–821, Jun. 2015. doi: 10.1016/j.jece.2015.03.030en

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