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Titolo:
Oxygen mobility in CeO2 and CexZr(1-x)O2 compounds: Study by CO transient oxidation and O-18/O-16 isotopic exchange
Autore:
Madier, Y; Descorme, C; Le Govic, AM; Duprez, D;
Indirizzi:
Univ Poitiers, Catalyse Chim Organ Lab, UMR CNRS 6503, F-86022 Poitiers, France Univ Poitiers Poitiers France F-86022 NRS 6503, F-86022 Poitiers, France Rhodia, Ctr Rech Aubervilliers, F-93308 Aubervilliers, France Rhodia Aubervilliers France F-93308 liers, F-93308 Aubervilliers, France
Titolo Testata:
JOURNAL OF PHYSICAL CHEMISTRY B
fascicolo: 50, volume: 103, anno: 1999,
pagine: 10999 - 11006
SICI:
1520-6106(199912)103:50<10999:OMICAC>2.0.ZU;2-N
Fonte:
ISI
Lingua:
ENG
Soggetto:
CEO2-ZRO2 SOLID-SOLUTIONS; TRANSFORM INFRARED-SPECTROSCOPY; TETRAGONAL PHASE-TRANSITION; CE0.5ZR0.5O2 MIXED-OXIDE; CERIUM OXIDE; STORAGE CAPACITY; CARBON-MONOXIDE; REDOX BEHAVIOR; THERMAL-STABILITY; ROOM-TEMPERATURE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
46
Recensione:
Indirizzi per estratti:
Indirizzo: Descorme, C Univ Poitiers, Catalyse Chim Organ Lab, UMR CNRS 6503, 40 Ave Recteur Pineau, F-86022 Poitiers, France Univ Poitiers 40 Ave Recteur Pineau Poitiers France F-86022 e
Citazione:
Y. Madier et al., "Oxygen mobility in CeO2 and CexZr(1-x)O2 compounds: Study by CO transient oxidation and O-18/O-16 isotopic exchange", J PHYS CH B, 103(50), 1999, pp. 10999-11006

Abstract

Cerium-zirconium mixed oxides (CexZr(1-x)O2), precalcined at 900 degrees Cin dry air, were supplied by Rhodia Terres Rares as monophasic solid solutions. Introduction of some zirconium atoms in the ceria lattice by isomorphous substitution clearly influences the final properties of these materialsas long as the cubic structure of ceria is maintained, Modifications in oxygen storage capacity (OSC measurements), redox properties (CO TPR), and oxygen exchange processes (TPIE) were studied. Ce0.63Zr0.37O2 was shown to have the most promising properties with-the largest OSC at 400 degrees C and the highest reactivity in O-2 exchange. All mixed oxides are able to exchange very large amounts of oxygen compared to ceria, implying the participation of bulk oxygen. Furthermore, on CexZr(1-x)O2 samples, oxygen is predominantly exchanged via a multiple heteroexchange mechanism involving surface dioxygen species as superoxides or peroxides.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 14/07/20 alle ore 12:43:14