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(-), O-2, 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.

Electron paramagnetic resonance spectra of CeO2 catalyst for CO oxidation / C. Oliva, G. Termignone, F. Vatti, L. Forni, A. Vishniakov. - In: JOURNAL OF MATERIALS SCIENCE. - ISSN 0022-2461. - 31:23(1996), pp. 6333-6338.

Electron paramagnetic resonance spectra of CeO2 catalyst for CO oxidation

C. Oliva
Primo
;
G. Termignone
Secondo
;
L. Forni
Penultimo
;
1996

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(-), O-2, 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.
Settore CHIM/02 - Chimica Fisica
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/186384
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