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Titolo:
Influence of the organic phase on the properties of CrO3-derived chromia aerogels
Autore:
Skapin, T;
Indirizzi:
Jozef Stefan Inst, Dept Inorgan Chem & Technol, SI-1000 Ljubljana, Slovenia Jozef Stefan Inst Ljubljana Slovenia SI-1000 SI-1000 Ljubljana, Slovenia
Titolo Testata:
JOURNAL OF NON-CRYSTALLINE SOLIDS
fascicolo: 1-3, volume: 285, anno: 2001,
pagine: 128 - 134
SICI:
0022-3093(20010601)285:1-3<128:IOTOPO>2.0.ZU;2-M
Fonte:
ISI
Lingua:
ENG
Soggetto:
METAL-OXIDE SURFACES; SELECTIVE OXIDATION; LIGHT-HYDROCARBONS; COMBUSTION; MGCR2O4; FTIR; ADSORPTION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
16
Recensione:
Indirizzi per estratti:
Indirizzo: Skapin, T Jozef Stefan Inst, Dept Inorgan Chem & Technol, Jamova 39, SI-1000 Ljubljana, Slovenia Jozef Stefan Inst Jamova 39 Ljubljana Slovenia SI-1000 Slovenia
Citazione:
T. Skapin, "Influence of the organic phase on the properties of CrO3-derived chromia aerogels", J NON-CRYST, 285(1-3), 2001, pp. 128-134

Abstract

A series of chromia materials was prepared from CrO3 and C-1-C-4 alcohols. After high-temperature super- or subcritical drying, considerable organic residue was detected and identified mainly as carboxylates. The amount and the identity of organic species depended, respectively, on the drying temperature and on the alcohol used. When organic content was reduced under inert conditions the resulting materials had high surface areas and were amorphous and partly reduced. Formate species are completely decomposed at 400 degreesC, while other C-2-C-4 carboxylates decompose at temperatures higher than 450 degreesC. Properties of CrO3-derived chromia materials reflect the chemical behaviour of alcoholic precursors during oxidation. All C-1-C-4 primary alcohols form aerogels while secondary and tertiary alcohols form differently shaped materials with inferior characteristics. Primary alcohols directly form stable carboxylate species on chromia surface. This process seems to promote the formation of solid aerogel structures. (C) 2001 ElsevierScience B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 12/07/20 alle ore 05:21:43