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Titolo:
Dynamic phenomena and catalytic reactivities of oxide surfaces
Autore:
Gaigneaux, EM; Dayem, HMA; Godard, E; Ruiz, P;
Indirizzi:
Univ Catholique Louvain, Unite Catalyse & Chim Mat Divises, B-1348 Louvain, Belgium Univ Catholique Louvain Louvain Belgium B-1348 , B-1348 Louvain, Belgium
Titolo Testata:
APPLIED CATALYSIS A-GENERAL
fascicolo: 2, volume: 202, anno: 2000,
pagine: 265 - 283
SICI:
0926-860X(20000814)202:2<265:DPACRO>2.0.ZU;2-6
Fonte:
ISI
Lingua:
ENG
Soggetto:
SELECTIVE OXIDATION CATALYSTS; SPILLOVER OXYGEN; COPPER-CATALYSTS; ATOMIC-FORCE; DEHYDROGENATION; MOO3; METHACROLEIN; DEHYDRATION; COOPERATION; BISTABILITY;
Keywords:
Mo trioxide; Bi molybdate; selective oxidation; dehydration; catalyst 'at work';
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
35
Recensione:
Indirizzi per estratti:
Indirizzo: Gaigneaux, EM Univ Catholique Louvain, Unite Catalyse & Chim Mat Divises, Croix Sud 2-17, B-1348 Louvain, Belgium Univ Catholique Louvain Croix Sud 2-17 Louvain Belgium B-1348
Citazione:
E.M. Gaigneaux et al., "Dynamic phenomena and catalytic reactivities of oxide surfaces", APP CATAL A, 202(2), 2000, pp. 265-283

Abstract

Oxide catalysts undergo numerous dynamic phenomena at their surfaces underthe conditions used for selective oxidation of hydrocarbons. This dynamic behavior influences catalytic performances and should thus be taken carefully into account in the understanding of the exact state of catalysts duringthe reaction and of phenomena like deactivations, synergetic effects, etc. This contribution reports examples in which dynamic behaviors of oxide surfaces under oxidation conditions dramatically dictate performances. It is concluded that the crucial key to maximize performances is to stabilize catalytic surfaces in slightly reduced suboxidic states. Such states allow catalytic oxidation cycles to proceed with high frequencies and favor reconstruction of catalysts and creation of active sites. Contrary, dynamic behaviors leading catalysts to more reduced or more oxidized states result in lowerperformances. Next to the tuning of O-2 and hydrocarbon partial pressures in the feed, adjustments of the stoichiometries and uses of the remote control mechanism and spillover oxygen appear as efficient approaches to masterthe dynamism of catalysts 'at work' and thus to optimize their performances. Finally, implications and perspectives of the understanding of dynamic phenomena at the surface of oxides are discussed. (C) 2000 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 15/07/20 alle ore 21:28:29