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

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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 http://hdl.handle.net/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 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
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

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