Abstract
Nanocrystalline cerium was synthesized by magnetron sputtering and inert gas condensation. Controlled post-oxidation of the metallic nanoclusters resulted in formation of oxygen-deficient cerium oxide. Catalytic redox reactions such as SO 2 reduction by CO and CO oxidation in air were investigated. A comparison of activity with conventional stoichiometric ceria catalysts was used as a probe to distinguish different surface reactions. Electrical conductivity of nanocrystalline CeO 2− x was investigated by impedance spectroscopy and compared with literature data for single-crystal CeO 2. The results are discussed in terms of the microstructure and defect chemistry of nanocrystalline cerium oxide.
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