fulltext.study @t Gmail

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

Paper ID Volume ID Publish Year Pages File Format Full-Text
47951 46486 2009 13 PDF Available
Title
Development of a Ce–Zr–La modified Pt/γ-Al2O3 TWCs’ washcoat: Effect of synthesis procedure on catalytic behaviour and thermal durability
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.

Keywords
Coprecipitation; Impregnation; Platinum; Alumina washcoat; Ceria–zirconia; Mixed-oxides; TWCs; Thermal aging; Simulated exhaust conditions; Automotive catalysts
First Page Preview
Development of a Ce–Zr–La modified Pt/γ-Al2O3 TWCs’ washcoat: Effect of synthesis procedure on catalytic behaviour and thermal durability
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 90, Issues 1–2, 25 July 2009, Pages 162–174
Authors
, , , , , ,
Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us