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Titolo:
PYROLYSIS GC-MS STUDY OF EXTERNAL COKE COMPOSITION ON H-ZSM-5 ZEOLITECATALYSTS
Autore:
HOLMES SM; GARFORTH A; DWYER J;
Indirizzi:
UNIV MANCHESTER,INST SCI & TECHNOL,DEPT CHEM,CTR MICROPOROUS MAT,SACKVILLE ST,POB 88 MANCHESTER M60 1QD LANCS ENGLAND
Titolo Testata:
Thermochimica acta
fascicolo: 1, volume: 294, anno: 1997,
pagine: 57 - 64
SICI:
0040-6031(1997)294:1<57:PGSOEC>2.0.ZU;2-T
Fonte:
ISI
Lingua:
ENG
Soggetto:
N-HEPTANE CRACKING; HYDROGEN MORDENITE; DEACTIVATION; COKING; REGENERATION; ZSM-5; MODE; HY;
Keywords:
CATALYST; COKE; H-ZSM-5; PYROLYSIS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
22
Recensione:
Indirizzi per estratti:
Citazione:
S.M. Holmes et al., "PYROLYSIS GC-MS STUDY OF EXTERNAL COKE COMPOSITION ON H-ZSM-5 ZEOLITECATALYSTS", Thermochimica acta, 294(1), 1997, pp. 57-64

Abstract

The composition of coke formed on the external surface of H-ZSM-5 during the cracking of hexadecane, at 350 degrees C and 20 atm pressure of hydrogen, was analysed using a combination of pyrolysis mass-spectrometry and transmission electron microscopy. It was shown that the external coke consisted of regions of graphite and areas of polyaromatic hydrocarbons. Pyrolysis at a range of temperatures showed cracking products with up to five aromatic rings. Using standard compounds, it was shown that cracking only occurred at exo-cyclic bonds, and therefore we can say that the regions of amorphous coke consist of large polyaromatic molecules linked by saturated hydrocarbon chains. It would appearthat these amorphous regions act as precursors to graphitic coke. (C)1997 Elsevier Science B.V.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/12/20 alle ore 03:55:47