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.
Titolo: | Electron paramagnetic resonance spectra of CeO2 catalyst for CO oxidation | |
Autori: | OLIVA, CESARE (Primo) TERMIGNONE, GIORGIO (Secondo) FORNI, LUCIO (Penultimo) | |
Settore Scientifico Disciplinare: | Settore CHIM/02 - Chimica Fisica | |
Data di pubblicazione: | 1996 | |
Rivista: | ||
Tipologia: | Article (author) | |
Digital Object Identifier (DOI): | http://dx.doi.org/10.1007/BF00354457 | |
Appare nelle tipologie: | 01 - Articolo su periodico |