Abstract
The effect of high surface area in porous nanostructured cerium oxide on chemical equilibrium with oxygen gas phase was investigated. Nanostructured cerium oxide was prepared by chemical precipitation. These materials were compacted and sintered at 600°C to porous nanostructured solids. Sample weight under varying oxygen partial pressure and temperature was measured and compared with microcrystalline CeO 2 reference sample. The change in sample weight relative to the oxidized sample was used to determine the degree of reduction. The interfacial equilibrium of cerium oxide surface with oxygen gas phase was analyzed on the basis of the van't Hoff equation. The binding enthalpy of oxygen was determined to −7.5 eV per oxygen atom.
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