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Controlled synthesis of nanocrystalline $CeO_{2}$ and $Ce_{1-x}M_{x}O_{2-\delta}$ (M = Zr, Y, Ti, Pr and Fe) solid solutions by the hydrothermal method:Structure and oxygen storage capacity

Singh, Preetam and Hegde, MS (2008) Controlled synthesis of nanocrystalline $CeO_{2}$ and $Ce_{1-x}M_{x}O_{2-\delta}$ (M = Zr, Y, Ti, Pr and Fe) solid solutions by the hydrothermal method:Structure and oxygen storage capacity. In: Journal of Solid State Chemistry, 181 (12). pp. 3248-3256.

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Abstract

CeO2 and Ce1-xMxO2-delta (M = Zr, Ti, Pr, Y and Fe) nanocrystallites of 5-10 nm sizes have been synthesized by hydrothermal method using diethylenetriamine (DETA) and melamine as complexing agents. Compounds have been characterized by powder X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and energy dispersive X-ray analysis (EDX) and their structures have been refined by the Rietveld method. All the compounds crystallize in cubic fluorite structure. Even up to 50% Zr and Y, 40% Ti, 25% Pr and 15% Fe is Substituted for Ce4+ in CeO2 by this method. Sizes of crystallites can be tuned by changing the complexing agent and reaction temperature. Nanocrystalline CeO2 and Ce1-xZrxO2 prepared here have higher or at least competitive oxygen storage capacity (OSC) than those reported in literature. Ce1-xFexO2-delta shows higher OSC and higher percentage of CO oxidation at lower temperature than Ce1-xZrxO2.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Elsevier Science.
Keywords: Ceria;Nanocrystallites;Hydrothermal synthesis;Oxygen storage capacity;CO oxidation.
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited: 30 Apr 2009 04:26
Last Modified: 19 Sep 2010 04:58
URI: http://eprints.iisc.ernet.in/id/eprint/17823

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