Singh, Preetam ; Hegde, M. S. (2008) Controlled synthesis of nanocrystalline CeO2 and Ce1-xMxO2-δ (M=Zr, Y, Ti, Pr and Fe) solid solutions by the hydrothermal method: structure and oxygen storage capacity Journal of Solid State Chemistry, 181 (12). pp. 3248-3256. ISSN 0022-4596
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Official URL: http://linkinghub.elsevier.com/retrieve/pii/S00224...
Related URL: http://dx.doi.org/10.1016/j.jssc.2008.08.018
Abstract
CeO2 and Ce1-xMxO2-δ (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-δ shows higher OSC and higher percentage of CO oxidation at lower temperature than Ce1-xZrxO2.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Elsevier Science. |
| Keywords: | Ceria; Nanocrystallites; Hydrothermal Synthesis; Oxygen Storage Capacity; CO Oxidation |
| ID Code: | 15769 |
| Deposited On: | 13 Nov 2010 12:34 |
| Last Modified: | 03 Jun 2011 07:17 |
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