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Titolo:
Coke formation during the methanol conversion to olefins in zeolites studied by UV Raman spectroscopy
Autore:
Li, J; Xiong, G; Feng, Z; Liu, Z; Xin, Q; Li, C;
Indirizzi:
Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China Chinese Acad Sci Dalian Peoples R China 116023 n 116023, Peoples R China
Titolo Testata:
MICROPOROUS AND MESOPOROUS MATERIALS
fascicolo: 1-2, volume: 39, anno: 2000,
pagine: 275 - 280
SICI:
1387-1811(200009)39:1-2<275:CFDTMC>2.0.ZU;2-H
Fonte:
ISI
Lingua:
ENG
Soggetto:
PARAMAGNETIC-RES MEASUREMENTS; HYDROGEN MORDENITE; HYDROCARBONS; CATALYSTS; ADSORPTION; MECHANISM; H-ZSM-5; NMR;
Keywords:
coke formation; UV Raman spectroscopy; methanol conversion; SAPO-34; zeolites;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
30
Recensione:
Indirizzi per estratti:
Indirizzo: Li, C Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, POB 110,Dalian 116023, Peoples R China Chinese Acad Sci POB 110 Dalian Peoples R China 116023 ples R China
Citazione:
J. Li et al., "Coke formation during the methanol conversion to olefins in zeolites studied by UV Raman spectroscopy", MICROP M M, 39(1-2), 2000, pp. 275-280

Abstract

Coke formation on/in ZSM-5, USY and SAPO-34 zeolites was investigated during the methanol conversion to olefins at temperatures from 298 to 773 K using ultraviolet (UV) Raman spectroscopy. The fluorescence interference that usually obscures the Raman spectra of zeolites in the conventional Raman spectroscopy, particularly for coked catalysts, can be successfully avoided in the UV Raman spectroscopy. Raman spectra are almost the same for adsorbedmethanol on the three zeolites at room temperature. However, the Raman spectra of the surface species formed at elevated temperatures are quite different for the three zeolites. Coke species formed in/on SAPO-34 are mainly polyolefinic species, and in/on ZSM-5 are some aromatic species, but polyaromatic or substituted aromatic species are predominant in USY at high temperatures. Most of the coke species can be removed after a treatment with O-2 at 773 K, while some small amount of coke species always remains in these zeolites, particularly for USY. The main reason for the different behavior of coke formation in the three zeolites could be attributed to the differentpore structures of the zeolites. (C) 2000 Elsevier Science B.V. All rightsreserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 22/10/20 alle ore 03:20:55