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Titolo:
Effects of the surface structure and experimental parameters on the isopropanol decomposition catalyzed with sol-gel MgO
Autore:
Wang, JA; Bokhimi, X; Novaro, O; Lopez, T; Gomez, R;
Indirizzi:
Univ Nacl Autonoma Mexico, Inst Fis, Mexico City 01000, DF, Mexico Univ Nacl Autonoma Mexico Mexico City DF Mexico 01000 y 01000, DF, Mexico Univ Autonoma Metropolitana Iztapalapa, Dept Chem, Mexico City 09340, DF, Mexico Univ Autonoma Metropolitana Iztapalapa Mexico City DF Mexico 09340 Mexico
Titolo Testata:
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
fascicolo: 1-2, volume: 145, anno: 1999,
pagine: 291 - 300
SICI:
1381-1169(19990908)145:1-2<291:EOTSSA>2.0.ZU;2-#
Fonte:
ISI
Lingua:
ENG
Soggetto:
METAL-OXIDE SURFACES; ZINC-OXIDE; 2-PROPANOL DECOMPOSITION; ALIPHATIC-ALCOHOLS; ACIDIC CHARACTER; ADSORPTION; TITANIA; SELECTIVITY; MAGNESIA; KINETICS;
Keywords:
isopropanol decomposition; structural defects; MgO; sol-gel catalyst; acidic-basic properties; dehydrogenation; acetone;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
32
Recensione:
Indirizzi per estratti:
Indirizzo: Novaro, O Univ Nacl Autonoma Mexico, Inst Fis, A P 20-364, Mexico City 01000, DF, Mexico Univ Nacl Autonoma Mexico A P 20-364 Mexico City DF Mexico 01000
Citazione:
J.A. Wang et al., "Effects of the surface structure and experimental parameters on the isopropanol decomposition catalyzed with sol-gel MgO", J MOL CAT A, 145(1-2), 1999, pp. 291-300

Abstract

Isopropanol decomposition was used as a probe reaction for characterizing the surface properties of sol-gel MgO catalysts, The specific surface area and the pore size distribution of the samples, calcined at different temperatures, were measured with the BET method. Acidity and basicity of the catalyst were determined by using TPD-NH3 and TPD-CO2 techniques. The total conversion and acetone selectivity depended on the: experimental conditions. Increasing reaction temperature significantly improved the total conversion,but reduced acetone selectivity. The activity and acetone selectivity obtained at the initial reaction were higher than that obtained after 15 min and 30 min of reaction. When water was added in the reaction stream, hydroxylgroups were formed on the MgO surface, a remarkable enhancement of the conversion and of the acetone selectivity was observed, The structural defectsand the specific surface area of the catalyst are also related to the activity and selectivity of the isopropanol decomposition, Two mechanisms were suggested for the explanation of acetone formation: in the case of water absent in the fed stream, the acetone was produced by the dehydrogenation route; in the case of water present in the reaction mixture, acetone was produced by the pathway of dehydrogenation accompanying the dehydration. (C) 1999 Elsevier Science B.V. All rights reserved.

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Documento generato il 30/05/20 alle ore 15:18:29