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An investigation of the role of Zr and La dopants into Ce1−x−yZrxLayOδ enriched γ-Al2O3 TWC washcoats

Paper ID Volume ID Publish Year Pages File Format Full-Text
42066 45909 2010 12 PDF Available
Title
An investigation of the role of Zr and La dopants into Ce1−x−yZrxLayOδ enriched γ-Al2O3 TWC washcoats
Abstract

This work involves the synthesis of composite three-way catalytic (TWC) washcoats consisting of 80 wt% of γ-alumina as the main supporting material, promoted with 20 wt% of ceria based solid solution. Pt in low loading (0.5 wt%) was employed as the only active phase. Washcoats varying in the solid solution composition (CexZryLazOδ), prepared by coprecipitation, are comparatively investigated in an attempt to elucidate the effect of Ce, Zr and La oxide promoters on the catalytic activity and thermal durability. For this purpose, catalytic activity measurements as well as detailed structural and morphological evaluations (differential thermal analysis (DTA), X-ray diffraction (XRD), N2 adsorption, oxygen storage capacity and DRIFTS analyses) were carried out before and after thermal aging in oxidative atmosphere. The catalytic performance was studied in loaded cordierite monoliths (TWCs form) under simulated exhaust conditions at the stoichiometric point. Doping ceria with Zr and La cation proved beneficial for both catalytic performance and thermal durability of the washcoat, with Ce0.4Zr0.5La0.1O1.9/γ-Al2O3/Pt sample presenting the optimum properties. The catalytic behavior is discussed based on oxygen storage capacity, noble metal dispersion and textural characteristics of the examined samples.

Graphical abstractComposite TWCs of γ-alumina promoted with ceria based solid solution and Pt (0.5 wt%) as the only active phase varying in the solid solution composition (CexZryLazOδ), are comparatively investigated. Doping ceria with Zr and La cation proved beneficial for both catalytic performance and thermal durability of the washcoat, with Ce0.4Zr0.5La0.1O1.9/γ-Al2O3/Pt sample presenting the optimum properties.Figure optionsDownload full-size imageDownload high-quality image (37 K)Download as PowerPoint slide

Keywords
TWCs; Alumina; Ceria; Thermal stability; Simulated exhaust conditions
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An investigation of the role of Zr and La dopants into Ce1−x−yZrxLayOδ enriched γ-Al2O3 TWC washcoats
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 382, Issue 1, 30 June 2010, Pages 73–84
Authors
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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