Title of article :
An investigation of the role of Zr and La dopants into Ce1−x−yZrxLayOδ enriched γ-Al2O3 TWC washcoats Original Research Article
Author/Authors :
A. Papavasiliou، نويسنده , , A. Tsetsekou، نويسنده , , V. Matsouka، نويسنده , , M. Konsolakis، نويسنده , , I.V. Yentekakis، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2010
Pages :
12
From page :
73
To page :
84
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.
Keywords :
TWCs , Ceria , thermal stability , Simulated exhaust conditions , Alumina
Journal title :
Applied Catalysis A:General
Serial Year :
2010
Journal title :
Applied Catalysis A:General
Record number :
1154504
Link To Document :
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