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Reducibility of $Ce_1_-_xZr_xO_2$: Origin of Enhanced Oxygen Storage Capacity

Dutta, Gargi and Waghmare, Umesh V and Baidya, Tinku and Hegde, MS and Priolkar, KR and Sarode, PR (2006) Reducibility of $Ce_1_-_xZr_xO_2$: Origin of Enhanced Oxygen Storage Capacity. In: Catalysis Letters, 108 (3-4). 165 -172.

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We combine first-principles calculations with EXAFS studies to investigate the origin of high oxygen storage capacity in ceria-zirconia solid solution, prepared by solution combustion method. We find that nanocrystalline $Ce_0_._5Zr_0_._5O_2$ can be reduced to $Ce_0_._5Zr_0_._5O_1_._5_7$ by $H_2$ upto 850 °C with an OSC of 65 cc/gm which is extremely high. Calculated local atomic-scale structure reveals the presence of long and short bonds resulting in four-fold coordination of the cations, confirmed by the EXAFS studies. Bond valence analysis of the microscopic structure and energetics is used to evaluate the strength of binding of different oxide ions and vacancies. We find the presence of strongly and weakly bound oxygens, of which the latter are responsible for the higher oxygen storage capacity in the mixed oxides than in the pure $CeO_2$

Item Type: Journal Article
Publication: Catalysis Letters
Publisher: Springer Link
Additional Information: Copyright of this article belongs to Springer Link.
Keywords: Biomimetic oxidation catalysts;Iotransformation;D-limonene;Porphyrin;uv–vis spectroscopy;Photooxidation
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited: 17 May 2006
Last Modified: 27 Aug 2008 11:59
URI: http://eprints.iisc.ac.in/id/eprint/6720

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