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Thermal aging behavior of Pt-only TWC converters under simulated exhaust conditions: Effect of rare earths (CeO2, La2O3) and Alkali (Na) modifiers

Matsouka Vasiliki, Konsolakis Michail, Yentekakis Ioannis.V., Papavasiliou Aggeliki, Tsetsekou Athina, Boukos Nikolaos

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URIhttp://purl.tuc.gr/dl/dias/0ABAF449-5706-444A-85EC-4F42591D9840-
Identifierhttps://doi.org/10.1007/s11244-011-9734-6-
Languageen-
Extent10en
TitleThermal aging behavior of Pt-only TWC converters under simulated exhaust conditions: Effect of rare earths (CeO2, La2O3) and Alkali (Na) modifiersen
CreatorMatsouka Vasilikien
CreatorΜατσουκα Βασιλικηel
CreatorKonsolakis Michailen
CreatorΚονσολακης Μιχαηλel
Creator Yentekakis Ioannis.V.en
Creator Papavasiliou Aggelikien
Creator Tsetsekou Athinaen
Creator Boukos Nikolaosen
PublisherSpringer USen
DescriptionΔημοσίευση σε επιστημονικό περιοδικό el
Content SummaryIn the present work, the feasibility to design monometallic (Pt-only), low metal loading (0.1 wt% Pt) three-way catalytic converters (TWCs), with comparable catalytic efficiency and thermostability to that of commercial bimetallic Pt/Rh TWCs has been explored. It is shown that this can be accomplished by modifying Pt/γ-Αl2O3 washcoat of TWC via two different methods of promotion: support-mediated promotion by modifying the γ-Al2O3 support with rare earth structure-modifiers (CeO2–La2O3) and surface-induced promotion by directly modifying the Pt surface with alkalies (e.g., Na), producing a doubly-promoted Pt(Na)/Al2O3-(CeO2–La2O3) TWC. The catalytic performance of as prepared TWCs in comparison to that of a commercial bimetallic (Pt–Rh) TWC, under simulated exhaust conditions at the stoichiometric point appears to be superior, even after severe thermal treatment at 900 °C for 5 h in air and despite the fact that the latter contain 4.5-fold higher noble metals loading. Moreover, the evolution of structural, textural and surface behavior of aged catalysts was identified by means of X-ray diffraction, scanning electron microscopy, transmission electron microscopy and diffuse reflectance infrared Fourier transform spectroscopy and appropriately correlated with the catalytic performance and thermostability of TWCs.el
Type of ItemPeer-Reviewed Journal Publicationen
Type of ItemΔημοσίευση σε Περιοδικό με Κριτέςel
Licensehttp://creativecommons.org/licenses/by/4.0/en
Date of Item2015-11-03-
Date of Publication2011-
SubjectThermal agingen
SubjectCatalyst promotionen
SubjectSimulated exhaust conditionsen
Bibliographic CitationV. Matsouka, M. Konsolakis, I.V. Yentekakis, A. Papavasiliou, A. Tsetsekou, N. Boukos ," Thermal aging behavior of Pt-only TWC converters under simulated exhaust conditions: Effect of rare earths (CeO2, La2O3) and Alkali (Na) modifiers," Topics in Catalysis, vol. 54, no. 16, pp. 1124-1134, Nov. 2011. doi: 10.1007/s11244-011-9734-6en

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