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Titolo:
THE INFLUENCE OF MECHANOCHEMICAL ACTIVATION ON COKE FORMATION ON ALUMINUM-OXIDE
Autore:
CHESNOKOV VV; MOLCHANOV VV; PAUKSHTIS EA; KONOVALOVA TA;
Indirizzi:
RUSSIAN ACAD SCI,SIBERIAN DIV,BORESKOV INST CATALYSIS NOVOSIBIRSK 630090 RUSSIA
Titolo Testata:
Kinetics and catalysis
fascicolo: 5, volume: 36, anno: 1995,
pagine: 698 - 700
SICI:
0023-1584(1995)36:5<698:TIOMAO>2.0.ZU;2-K
Fonte:
ISI
Lingua:
ENG
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
5
Recensione:
Indirizzi per estratti:
Citazione:
V.V. Chesnokov et al., "THE INFLUENCE OF MECHANOCHEMICAL ACTIVATION ON COKE FORMATION ON ALUMINUM-OXIDE", Kinetics and catalysis, 36(5), 1995, pp. 698-700

Abstract

Processes occurring during mechanochemical activation (MA) of gamma-Al2O3 are studied by physicochemical methods. As a result of MA, the surface concentration of coordinatively unsaturated aluminum ions falls. The concentration of strong Lewis acid sites decreases by two orders of magnitude, and that of weak Lewis centers falls several times, whereas the bulk concentration of octahedrally and tetrahedrally coordinated aluminum ions remains unchanged. MA of gamma-Al2O3 is shown to suppress coke formation. The reason behind this effect is the decrease in the concentration of acceptor sites involved in the active sites responsible for coke formation at the surface of alumina The strongest acceptor sites vanish at the initial stages of MA. The contribution of these centers in the coke formation on alumina is insignificant, whereas the weaker acceptor sites that are more resistant to MA make an essential contribution.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 18/09/20 alle ore 10:05:00