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N2O decomposition over doubly-promoted Pt(K)/Al2O3–(CeO2–La2O3) structured catalysts: On the combined effects of promotion and feed composition

Konsolakis Michail, Alygizaki Angeliki, Goula G., Yentekakis Ioannis V.

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URIhttp://purl.tuc.gr/dl/dias/FAD0A7C1-3EC9-4C10-AC51-3F4C128185EE-
Identifierhttps://doi.org/10.1016/j.cej.2013.06.083-
Languageen-
Extent9en
TitleN2O decomposition over doubly-promoted Pt(K)/Al2O3–(CeO2–La2O3) structured catalysts: On the combined effects of promotion and feed compositionen
CreatorKonsolakis Michailen
CreatorΚονσολακης Μιχαηλel
CreatorAlygizaki Angelikien
CreatorΑλυγιζακη Αγγελικηel
Creator Goula G.en
CreatorYentekakis Ioannis V. en
PublisherElsevieren
DescriptionΔημοσίευση σε επιστημονικό περιοδικό el
Content SummaryIn the present study the feasibility of enhancing the N2O decomposition activity of Pt supported on Al2O3, by means of combined structural and surface promotion is explored by employing: (i) support-mediated promotion by rare earth oxides (CeO2, La2O3) incorporation into the Al2O3 support and (ii) surface-induced promotion by deposition of potassium. The study is conducted over structured catalysts suitable for practical applications, i.e., honeycomb cordierite monoliths washcoated with the catalyst composite. The chemical formula of the low active metal loaded (0.5 wt% Pt) doubly-promoted catalyst composite is: 0.5 wt%Pt(0–2 wt%K)/Al2O3–(16 wt%CeO2 + 4 wt%La2O3). Assessment of the de-N2O catalysts performance, either in the presence or absence of O2, CO and H2O in the feed steam, reveals the superiority of the doubly-promoted Pt(K)/Al2O3–(CeO2 + La2O3) catalysts in comparison to the bare Pt/Al2O3. Specifically, the de-N2O performance of Pt/Al2O3 is dramatically enhanced by incorporation of 20 wt% CeO2–La2O3 mixed oxide on the Al2O3 support and then further improved by 2 wt% K addition: the initial very poor de-N2O efficiency of ca. 35% N2O conversion at 600 °C over Pt/Al2O3 is led to 100% N2O conversion at ca. 500 °C over the structural-promoted Pt/Al2O3–(CeO2 + La2O3), which is finally achieved at ca. 440 °C over the doubly-promoted Pt(2 wt%K)/Al2O3–(CeO2 + La2O3) monolith. In all cases (bare, structural- or doubly-promoted catalysts), the de-N2O efficiency is strongly affected by the reaction conditions, following the sequence N2O + CO ≫ N2O > N2O + O2 > N2O + O2 + CO. Water vapor and/or (H2 + O2) in the feed strongly suppresses the de-N2O performance in a partially reversible manner. The de-N2O efficiency, however, can be totally restored by H2 addition into N2O + H2O feed.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 Publication2013-
SubjectN2O decompositionen
SubjectRare earth oxidesen
SubjectCatalysts promotionen
Bibliographic Citation M. Konsolakis, A. Alygizou, G. Goula, I.V. Yentekakis, "N2O decomposition over doubly-promoted Pt(K)/Al2O3–(CeO2–La2O3) structured catalysts: On the combined effects of promotion and feed composition," Chemical Engineering Journal, vol. 230, pp. 286–295, Aug. 2013. doi: 10.1016/j.cej.2013.06.083en

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