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Titolo:
SURFACE-TREATED ACTIVATED CARBONS AS CATALYSTS FOR THE DEHYDRATION AND DEHYDROGENATION REACTIONS OF ETHANOL
Autore:
CARRASCOMARIN F; MUEDEN A; MORENOCASTILLA C;
Indirizzi:
UNIV GRANADA,FAC CIENCIAS,DEPT QUIM INORGAN E-18071 GRANADA SPAIN UNIV GRANADA,FAC CIENCIAS,DEPT QUIM INORGAN E-18071 GRANADA SPAIN
Titolo Testata:
JOURNAL OF PHYSICAL CHEMISTRY B
fascicolo: 46, volume: 102, anno: 1998,
pagine: 9239 - 9244
SICI:
1089-5647(1998)102:46<9239:SACACF>2.0.ZU;2-1
Fonte:
ISI
Lingua:
ENG
Soggetto:
SELECTIVE DEHYDROGENATION; CONVERSION; DECOMPOSITION; SILICA; SITES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
36
Recensione:
Indirizzi per estratti:
Citazione:
F. Carrascomarin et al., "SURFACE-TREATED ACTIVATED CARBONS AS CATALYSTS FOR THE DEHYDRATION AND DEHYDROGENATION REACTIONS OF ETHANOL", JOURNAL OF PHYSICAL CHEMISTRY B, 102(46), 1998, pp. 9239-9244

Abstract

Two activated carbons were prepared from olive stones with different degrees of activation and oxidized with a (NH4)(2)S2O8 solution for variable periods of time to introduce different amounts of oxygen surface complexes. Samples so prepared were characterized to know their surface area, porosity, and surface chemistry and then were used as catalysts in the conversion reactions of ethanol. The dehydration reactions to obtain ethene and ether only occurred on the oxidized samples, where carboxyl groups placed on the external surface of the particles wereresponsible for these reactions. The dehydrogenation reaction to yield acetaldehyde took place on either acid or basic surface sites placednot only on the external surface, but also on some part of the internal surface. During the reaction some surface active sites for dehydrogenation were lost because some hydrogen remained bound to them. The presence of air in the reactant mixture cleaned some of these sites, increasing the dehydrogenation activity and decreasing the dehydration activity. Also studied was the effect on their activity of the pretreatments of the catalysts in He or H-2 flow at different temperatures up to 1273 K.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 21/09/20 alle ore 06:38:41