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

Matsouka, V; Konsolakis, M; Yentekakis, IV; Papavasiliou, A; Tsetsekou, A; Boukos, N

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