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Titolo:
Improvement of coke-induced selectivation of H-ZSM-5 during xylene isomerization
Autore:
Bauer, F; Chen, WH; Zhao, Q; Freyer, A; Liu, SB;
Indirizzi:
Acad Sinica, Inst Atom & Mol Sci, Taipei 106, Taiwan Acad Sinica Taipei Taiwan 106 a, Inst Atom & Mol Sci, Taipei 106, Taiwan Univ Leipzig, Inst Oberflachenmodifizierung, D-04303 Leipzig, Germany UnivLeipzig Leipzig Germany D-04303 fizierung, D-04303 Leipzig, Germany
Titolo Testata:
MICROPOROUS AND MESOPOROUS MATERIALS
fascicolo: 1, volume: 47, anno: 2001,
pagine: 67 - 77
SICI:
1387-1811(200109)47:1<67:IOCSOH>2.0.ZU;2-0
Fonte:
ISI
Lingua:
ENG
Soggetto:
ETHYLBENZENE DISPROPORTIONATION; TOLUENE DISPROPORTIONATION; H-MORDENITE; ZEOLITES; COKING; DEACTIVATION; REGENERATION; CATALYSTS; OXIDATION; HZSM-5;
Keywords:
xylene isomerization; H-ZSM-5; coke selectivation; post-treatment; pre-coking; Xe-129 NMR;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
32
Recensione:
Indirizzi per estratti:
Indirizzo: Bauer, F Acad Sinica, Inst Atom & Mol Sci, POB 23-166, Taipei 106, Taiwan Acad Sinica POB 23-166 Taipei Taiwan 106 166, Taipei 106, Taiwan
Citazione:
F. Bauer et al., "Improvement of coke-induced selectivation of H-ZSM-5 during xylene isomerization", MICROP M M, 47(1), 2001, pp. 67-77

Abstract

An improvement of coke-induced selectivation was achieved by an additionalthermal treatment of the pre-coked H-ZSM-5 catalysts with hydrogen or alkanes. By means of the conventional pre-coking procedure using methanol as coke precursor, a sample containing only a small amount of carbonaceous deposits (approximate to 0.3 wt.%) is effective in reducing the undesirable transalkylation products during xylene isomerization. However, upon additional post-treatment by propane, the modified H-ZSM-5 catalyst exhibited a lower xylene loss (approximate to 1.1%) while maintaining a reasonable activity for ethylbenzene conversion (approximate to 55%), as compared to that pre-coked with the xylene feed under high severity conditions. (C) 2001 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 31/03/20 alle ore 22:46:17