Development of a Ce-Zr-La modified Pt/gamma-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	2014-03-01T01:58:52Z
dc.date.available	2014-03-01T01:58:52Z
dc.date.issued	2009	en
dc.identifier.issn	0926-3373	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/28763
dc.subject	Coprecipitation	en
dc.subject	Impregnation	en
dc.subject	Platinum	en
dc.subject	Alumina washcoat	en
dc.subject	Ceria-zirconia	en
dc.subject	Mixed-oxides	en
dc.subject	TWCs	en
dc.subject	Thermal aging	en
dc.subject	Simulated exhaust conditions	en
dc.subject	Automotive catalysts	en
dc.subject.classification	Chemistry, Physical	en
dc.subject.classification	Engineering, Environmental	en
dc.subject.classification	Engineering, Chemical	en
dc.subject.other	AUTOMOTIVE EXHAUST CATALYSTS	en
dc.subject.other	METHANE PARTIAL OXIDATION	en
dc.subject.other	OXYGEN STORAGE CAPACITY	en
dc.subject.other	CEO2-ZRO2 MIXED OXIDES	en
dc.subject.other	SUPPORTED PLATINUM	en
dc.subject.other	3-WAY CATALYSTS	en
dc.subject.other	SOLID-SOLUTIONS	en
dc.subject.other	REDOX PROPERTIES	en
dc.subject.other	PT/CEZRO2/AL2O3 CATALYSTS	en
dc.subject.other	POWDER CHARACTERISTICS	en
dc.title	Development of a Ce-Zr-La modified Pt/gamma-Al2O3 TWCs' washcoat: Effect of synthesis procedure on catalytic behaviour and thermal durability	en
heal.type	journalArticle	en
heal.language	English	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/gamma-Al2O3 three-way converters (TWCs) washcoat is investigated. The production procedures applied were: (i) simultaneous coprecipitation of gamma-alumina and ceria-based solid solution from metal nitrates, (ii) sequential coprecipitation of these components and (iii) wet impregnation with different gamma-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 degrees C for 2 h and thermal aging at 900 degrees C for 5 h in air. X-ray diffraction (XRD), transmission electron microscopy (TEM), Brunauer-Emmett-Telter 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. (C) 2009 Elsevier B.V. All rights reserved.	en
heal.publisher	ELSEVIER SCIENCE BV	en
heal.journalName	APPLIED CATALYSIS B-ENVIRONMENTAL	en
dc.identifier.isi	ISI:000267380100021	en
dc.identifier.volume	90	en
dc.identifier.issue	1-2	en
dc.identifier.spage	162	en
dc.identifier.epage	174	en