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EnglishAmong the factors affecting ceria activity, the defectiveness plays a key role in the case of CO oxidation. In this study, its connection with the catalytic performance was investigated via in-situ Raman spectroscopy on nanostructured pure and Cu/Mn-doped ceria, monitoring the defect sites and surface species evolution during the reaction. The accumulation of polyene-like chains, formed through CO dissociative adsorption at the catalyst surface, was observed and their disappearance was related to the catalyst light-off temperature. Moreover, the doped samples exhibited a rise of the Raman bands associated to defects after the tests, consequence of the structural rearrangements occurring during CO oxidation. Indeed, in-situ Raman measurements during reduction (CO/N2) and oxidation cycles at 400 °C evidenced the formation of oxygen vacancy clusters in reducing atmosphere, which could reorganize not only in O2 but also upon a temperature decrease, forming isolated vacancies and then evolving in Frenkel and extrinsic oxidized dopant-containing sites when exposed to oxygen.
New insights on the defect sites evolution during CO oxidation over doped ceria nanocatalysts probed by in situ Raman spectroscopy / Sartoretti, E.; Novara, C.; Fontana, M.; Giorgis, F.; Piumetti, M.; Bensaid, S.; Russo, N.; Fino, D.. - In: APPLIED CATALYSIS A: GENERAL. - ISSN 0926-860X. - ELETTRONICO. - 596(2020), p. 117517. [10.1016/j.apcata.2020.117517]
| Titolo: | New insights on the defect sites evolution during CO oxidation over doped ceria nanocatalysts probed by in situ Raman spectroscopy | |
| Autori: | ||
| Data di pubblicazione: | 2020 | |
| Rivista: | ||
| Digital Object Identifier (DOI): | http://dx.doi.org/10.1016/j.apcata.2020.117517 | |
| Appare nelle tipologie: | 1.1 Articolo in rivista |
File in questo prodotto:
| File | Descrizione | Tipologia | Licenza | |
|---|---|---|---|---|
| Sartoretti_et_al_2020_Appl_Catal_A.pdf | Article | 2. Post-print / Author's Accepted Manuscript |  | Visibile a tuttiVisualizza/Apri |
| 1-s2.0-S0926860X20301101-main.pdf | 2a Post-print versione editoriale / Version of Record | Non Pubblico - Accesso privato/ristretto | Administrator Richiedi una copia | |
| 1-s2.0-S0926860X20301101-mmc1.pdf | Appendix A. Supplementary data. - Acrobat PDF file (1MB) | Altro materiale allegato | PUBBLICO - Tutti i diritti riservati | Visibile a tuttiVisualizza/Apri |
http://hdl.handle.net/11583/2809292
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