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

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dc.contributor.author Matsouka, V en
dc.contributor.author Konsolakis, M en
dc.contributor.author Yentekakis, IV en
dc.contributor.author Papavasiliou, A en
dc.contributor.author Tsetsekou, A en
dc.contributor.author Boukos, N en
dc.date.accessioned 2014-03-01T02:53:30Z
dc.date.available 2014-03-01T02:53:30Z
dc.date.issued 2011 en
dc.identifier.issn 10225528 en
dc.identifier.uri https://dspace.lib.ntua.gr/xmlui/handle/123456789/36368
dc.subject Catalyst promotion en
dc.subject CeO2 en
dc.subject DRIFT en
dc.subject FT-IR en
dc.subject La2O3 en
dc.subject Na en
dc.subject Platinum en
dc.subject Simulated exhaust conditions en
dc.subject Thermal aging en
dc.subject TWCs en
dc.subject.other Catalyst promotion en
dc.subject.other CeO <sub>2</sub> en
dc.subject.other DRIFT en
dc.subject.other FT-IR en
dc.subject.other Simulated exhaust conditions en
dc.subject.other TWCs en
dc.subject.other Catalyst activity en
dc.subject.other Catalytic converters en
dc.subject.other Fourier transform infrared spectroscopy en
dc.subject.other Lanthanum en
dc.subject.other Lanthanum oxides en
dc.subject.other Precious metals en
dc.subject.other Rare earths en
dc.subject.other Rhodium en
dc.subject.other Scanning electron microscopy en
dc.subject.other Sodium en
dc.subject.other Spectroscopy en
dc.subject.other Thermal aging en
dc.subject.other Transmission electron microscopy en
dc.subject.other X ray diffraction en
dc.subject.other Platinum en
dc.title Thermal aging behavior of Pt-only TWC converters under simulated exhaust conditions: Effect of rare earths (CeO2, La2O3) and alkali (Na) modifiers en
heal.type conferenceItem en
heal.identifier.primary 10.1007/s11244-011-9734-6 en
heal.identifier.secondary http://dx.doi.org/10.1007/s11244-011-9734-6 en
heal.publicationDate 2011 en
heal.abstract In 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. © 2011 Springer Science+Business Media, LLC. en
heal.journalName Topics in Catalysis en
dc.identifier.doi 10.1007/s11244-011-9734-6 en
dc.identifier.volume 54 en
dc.identifier.issue 16-18 en
dc.identifier.spage 1124 en
dc.identifier.epage 1134 en

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