Development of a Ce-Zr-La modified Pt/γ-Al2O3 TWCs' washcoat: Effect of synthesis procedure on catalytic behaviour and thermal durability

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

dc.contributor.author	Papavasiliou, A	en
dc.contributor.author	Tsetsekou, A	en
dc.contributor.author	Matsouka, V	en
dc.contributor.author	Konsolakis, M	en
dc.contributor.author	Yentekakis, IV	en
dc.contributor.author	Boukos, N	en
dc.date.accessioned	2014-03-01T01:30:10Z
dc.date.available	2014-03-01T01:30:10Z
dc.date.issued	2009	en
dc.identifier.issn	09263373	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/19489
dc.subject	Alumina washcoat	en
dc.subject	Automotive catalysts	en
dc.subject	Ceria-zirconia	en
dc.subject	Coprecipitation	en
dc.subject	Impregnation	en
dc.subject	Mixed-oxides	en
dc.subject	Platinum	en
dc.subject	Simulated exhaust conditions	en
dc.subject	Thermal aging	en
dc.subject	TWCs	en
dc.subject.other	Automotive catalysts	en
dc.subject.other	Ceria-zirconia	en
dc.subject.other	Mixed-oxides	en
dc.subject.other	Simulated exhaust conditions	en
dc.subject.other	TWCs	en
dc.subject.other	Adsorption	en
dc.subject.other	Aluminum	en
dc.subject.other	Calcination	en
dc.subject.other	Catalysis	en
dc.subject.other	Catalyst activity	en
dc.subject.other	Cerium	en
dc.subject.other	Cerium alloys	en
dc.subject.other	Cerium compounds	en
dc.subject.other	Coprecipitation	en
dc.subject.other	Fourier transform infrared spectroscopy	en
dc.subject.other	Impregnation	en
dc.subject.other	Lanthanum	en
dc.subject.other	Light	en
dc.subject.other	Nitrogen compounds	en
dc.subject.other	Platinum	en
dc.subject.other	Silicate minerals	en
dc.subject.other	Sintered alumina	en
dc.subject.other	Sintering	en
dc.subject.other	Thermal aging	en
dc.subject.other	Thermodynamic stability	en
dc.subject.other	Transmission electron microscopy	en
dc.subject.other	X ray diffraction	en
dc.subject.other	Zirconia	en
dc.subject.other	Zirconium	en
dc.subject.other	Alumina	en
dc.title	Development of a Ce-Zr-La modified Pt/γ-Al2O3 TWCs' washcoat: Effect of synthesis procedure on catalytic behaviour and thermal durability	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.apcatb.2009.03.006	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.apcatb.2009.03.006	en
heal.publicationDate	2009	en
heal.abstract	In this work the effect of different synthesis routes on the thermal stability and catalytic performance of Ce-Zr-La modified Pt/γ-Al2O3 three-way converters (TWCs) washcoat is investigated. The production procedures applied were: (i) simultaneous coprecipitation of γ-alumina and ceria-based solid solution from metal nitrates, (ii) sequential coprecipitation of these components and (iii) wet impregnation with different γ-alumina powders (a commercial and a precipitated one). The performance of the as produced catalysts, after loading on cordierite monoliths (TWCs form) was studied under simulated exhaust conditions at the stoichiometric point. Structural, morphological and catalytic properties of the washcoats were examined after calcination at 600 °C for 2 h and thermal aging at 900 °C for 5 h in air. X-ray diffraction (XRD), transmission electron microscopy (TEM), Brunauer-Emmett-Teller physical adsorption (BET) and diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) were applied for the correlation of the samples' catalytic behaviour with their microstructure and morphological characteristics. Among the preparation routes examined simultaneous coprecipitation leads to the most thermally stable washcoat; it was found to provide higher dispersion of the oxide modifiers in the alumina carrier impeding that way Pt sintering. TWCs prepared by this route also showed the best catalytic performance providing the maximum NO, CO and C3H6 conversions and the lowest light-off temperatures. © 2009 Elsevier B.V. All rights reserved.	en
heal.journalName	Applied Catalysis B: Environmental	en
dc.identifier.doi	10.1016/j.apcatb.2009.03.006	en
dc.identifier.volume	90	en
dc.identifier.issue	1-2	en
dc.identifier.spage	162	en
dc.identifier.epage	174	en