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Titolo:
Al-MCM-41: its acidity and activity in cyclohexene conversion
Autore:
Rozwadowski, M; Datka, J; Lezanska, M; Wloch, J; Erdmann, K; Kornatowski, J;
Indirizzi:
Nicholas Copernicus Univ, Fac Chem, PL-87100 Torun, Poland Nicholas Copernicus Univ Torun Poland PL-87100 m, PL-87100 Torun, Poland Jagiellonian Univ, Fac Chem, PL-30060 Krakow, Poland Jagiellonian Univ Krakow Poland PL-30060 c Chem, PL-30060 Krakow, Poland Tech Univ Munich, Lehrstuhl Tech Chem 2, D-85747 Garching, Germany Tech Univ Munich Garching Germany D-85747 m 2, D-85747 Garching, Germany
Titolo Testata:
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
fascicolo: 22, volume: 3, anno: 2001,
pagine: 5082 - 5086
SICI:
1463-9076(2001)3:22<5082:AIAAAI>2.0.ZU;2-Z
Fonte:
ISI
Lingua:
ENG
Soggetto:
MESOPOROUS MOLECULAR-SIEVES; ISOMERIZATION REACTION; CATALYTIC CONVERSION; USHY ZEOLITE; MCM-41; COKE; POLYETHYLENE; HYDROCARBONS; OXIDATION; SULFATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
34
Recensione:
Indirizzi per estratti:
Indirizzo: Rozwadowski, M Nicholas Copernicus Univ, Fac Chem, Gagarina 7, PL-87100 Torun, Poland Nicholas Copernicus Univ Gagarina 7 Torun Poland PL-87100
Citazione:
M. Rozwadowski et al., "Al-MCM-41: its acidity and activity in cyclohexene conversion", PHYS CHEM P, 3(22), 2001, pp. 5082-5086

Abstract

Investigation of cyclohexene conversion over Al-MCM-41 has shown that the concentrations of Bronsted and Lewis acid sites increase with the Al content of the materials. The conversion follows mainly two mechanisms: cyclohexene skeletal isomerisation (CSI) and hydrogen transfer (HT). The products with 6 carbon atoms in a molecule prevail in all cases. Some amounts of products with 1 to 8 carbon atoms are also formed as a result of cracking or alkylation. All these reactions can occur at the acidic centres of the catalysts. The process of conversion, proceeding over the Bronsted acid sites, results in the formation of coke deposits in addition to volatile products. The amount of coke decreases with increasing reaction temperature and decreasing Al content of the material. The deposits cause a decrease in the effective concentrations of both the Bronsted and Lewis acid sites. Thermodesorption of pyridine has shown that (i) the concentrations of the Bronsted and Lewis acid sites before and after the conversion processes differ only slightly and (ii) the acidic strength of the Bronsted sites is almost independent of their concentration and the Si/Al ratio.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/03/20 alle ore 10:53:16