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Titolo:
TEXTURE, ELECTRON-ACCEPTOR, ACID-BASE, AND CATALYTIC PROPERTIES OF MODIFIED ZEOLITES OF ZSM-5 TYPE .3. STUDY OF THE PROCESS OF COKE FORMATION
Autore:
SLINKIN AA; BRAGINA GO; NISSENBAUM VD; KUCHEROV AV;
Indirizzi:
RUSSIAN ACAD SCI,ZELINSKII INST ORGAN CHEM MOSCOW 117334 RUSSIA
Titolo Testata:
Kinetics and catalysis
fascicolo: 3, volume: 36, anno: 1995,
pagine: 403 - 411
SICI:
0023-1584(1995)36:3<403:TEAACP>2.0.ZU;2-2
Fonte:
ISI
Lingua:
ENG
Soggetto:
PARAMAGNETIC-RES MEASUREMENTS; HYDROGEN MORDENITE; DESORBED PRODUCTS; MULTINUCLEAR NMR; H-ZSM5 ZEOLITE; DEACTIVATION; COKING; OLEFINS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
27
Recensione:
Indirizzi per estratti:
Citazione:
A.A. Slinkin et al., "TEXTURE, ELECTRON-ACCEPTOR, ACID-BASE, AND CATALYTIC PROPERTIES OF MODIFIED ZEOLITES OF ZSM-5 TYPE .3. STUDY OF THE PROCESS OF COKE FORMATION", Kinetics and catalysis, 36(3), 1995, pp. 403-411

Abstract

Zeolites of the HZSM-5 type (SiO2/Al2O3 = 32, 40, 48, 55, 66, and 840), both the parent form and those modified by tetraethoxysilane, were coked by p-xylene or n-hexane treatment during ethylbenzene disproportionation and studied by DTA-DTG and ESR spectroscopy. The sites on theouter surface of zeolites under investigation do not contribute to coking, at least, formation stage of low-condensed coke located inside zeolitic channels. The formed coke is not uniform: the polycondensed part of coke is deposited on the outer surface and the oxygen from the gas phase promotes its formation. We assume that only a small part of both acidic sites and sites of one-electron transfer takes part in the coking of all the samples differing in the SiO2/Al2O3 ratio.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 05/12/20 alle ore 16:36:52