Abstract
The EPR spectra of freshly prepared CeO2 samples as well as of samples used as a catalyst in the oxidation of CO to CO2 are reported. Attribution of these patterns to oxygen species O −2 , O2, O−, or to Ce3+ ions is discussed and dynamic phenomena involving these species are described. Bottlenecked systems between conduction electrons and Ce3+ ions are envoked to explain the observation of the Ce3+ EPR spectrum up to temperatures of about 370 K. Oxygen-deficient systems are obtained when the sample is used as a catalyst for CO oxidation in the presence of pyrex or quartz powder as a diluent, showing that the latter can play some role in stabilizing such species.
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Oliva, C., Termignone, G., Vatti, F.P. et al. Electron paramagnetic resonance spectra of CeO2 catalyst for CO oxidation. JOURNAL OF MATERIALS SCIENCE 31, 6333–6338 (1996). https://doi.org/10.1007/BF00354457
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DOI: https://doi.org/10.1007/BF00354457