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Titolo:
Investigation of coke deposits on Al-MCM-41
Autore:
Rozwadowski, M; Lezanska, M; Wloch, J; Erdmann, K; Golembiewski, R; Kornatowski, J;
Indirizzi:
Nicholas Copernicus Univ, Fac Chem, PL-87100 Torun, Poland Nicholas Copernicus Univ Torun Poland PL-87100 m, PL-87100 Torun, 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:
CHEMISTRY OF MATERIALS
fascicolo: 5, volume: 13, anno: 2001,
pagine: 1609 - 1616
SICI:
0897-4756(200105)13:5<1609:IOCDOA>2.0.ZU;2-J
Fonte:
ISI
Lingua:
ENG
Soggetto:
MESOPOROUS MOLECULAR-SIEVES; PARAMAGNETIC-RES MEASUREMENTS; ULTRASTABLE ZEOLITE-Y; HYDROGEN MORDENITE; SORPTION PROPERTIES; NMR-SPECTROSCOPY; HEXANE CRACKING; HY ZEOLITES; MCM-41; COKING;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
50
Recensione:
Indirizzi per estratti:
Indirizzo: Rozwadowski, M Nicholas Copernicus Univ, Fac Chem, 7 Gagarin St, PL-87100 Torun, Poland Nicholas Copernicus Univ 7 Gagarin St Torun Poland PL-87100
Citazione:
M. Rozwadowski et al., "Investigation of coke deposits on Al-MCM-41", CHEM MATER, 13(5), 2001, pp. 1609-1616

Abstract

Carbonaceous compounds deposited on aluminosilicate mesoporous molecular sieves of the MCM-41 type during conversion of cyclohexene at various temperatures were investigated using TGA; DRIFT, UV-vis, and C-13 Solid State NMRspectroscopies; and a sorption technique. The chemical composition of the deposits is not significantly affected by the Al content of Al-MCM-41 and depends mainly on the temperature and the duration of the reaction. At lowerapplied temperatures, both aliphatic and aromatic compounds are formed; they are relatively weakly bound to the surface of the material. After a longer reaction period, some deposits appear that are strongly bound to the surface. At higher temperatures, a fraction of the coke migrates out of the pores. Then, part of the coke (most likely aliphatics) desorbs and moves away, while the other part (presumably aromatics) adsorbs on the external surface of the sieve. The coke remaining both in the pores and on the external surface mostly forms multilayered polyaromatic structures that are strongly bound to the surface of the material. The water sorption capacity of the studied materials decreases with the content of the deposits.

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Documento generato il 05/12/20 alle ore 16:24:30