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Titolo:
TITANIUM-COBALT CLUSTER OF CLUSTER-BASED CATALYSTS FOR THE SELECTIVE HYDROGENATION OF ALPHA,BETA-UNSATURATED ALDEHYDES
Autore:
LANEVE MC; LEI XJ; FEHLNER TP; WOLF EE;
Indirizzi:
UNIV NOTRE DAME,DEPT CHEM ENGN NOTRE DAME IN 46556 UNIV NOTRE DAME,DEPT CHEM & BIOCHEM NOTRE DAME IN 46556
Titolo Testata:
Journal of catalysis (Print)
fascicolo: 1, volume: 177, anno: 1998,
pagine: 11 - 21
SICI:
0021-9517(1998)177:1<11:TCOCCF>2.0.ZU;2-T
Fonte:
ISI
Lingua:
ENG
Soggetto:
COPPER ALUMINA CATALYST; CROTONALDEHYDE HYDROGENATION; MODEL CATALYSTS; 1,3-BUTADIENE; PRESSURE; KETONES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
38
Recensione:
Indirizzi per estratti:
Citazione:
M.C. Laneve et al., "TITANIUM-COBALT CLUSTER OF CLUSTER-BASED CATALYSTS FOR THE SELECTIVE HYDROGENATION OF ALPHA,BETA-UNSATURATED ALDEHYDES", Journal of catalysis (Print), 177(1), 1998, pp. 11-21

Abstract

The characterization and catalytic properties of a new molecular cluster precursor, Ti4O4[OCH(CH3)(2)](4){(CO)(9)Co3CCO2}(4), denoted Ti4Co12, were studied during the vapor phase hydrogenation of 2-butenal to form the thermodynamically less favored product, 2-butenol. Pyrolysis of this precursor yields three active catalytic forms, designated LT-,HT1-, and HT2-. This catalyst shows enhanced thermal stability (up to400 degrees C) as compared to M-2{(CO)(9)Co3CCO2}(4) (where M=Co, Cu,or Mo) and M4O{(CO)(9)Co3CCO2}(6) (where M = Zn or Co), which are stable only to 300 degrees C. It has been found that the HT1-Ti4Co12 structure provides significantly better selectivity to 2-butenol than the HT2-Ti4Co12 structure. In-situ DRIFTS measurements during the decomposition of the precursor indicate the presence of COO- groups during theformation of the selective HT1-Ti4Co12 form. These groups disappear at higher temperatures when the HT2-Ti4Co12 catalyst is formed. We speculate that these ions are related to the high selectivity of these materials. (C) 1998 Academic Press.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 13/07/20 alle ore 11:11:06