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Titolo:
Monitoring of molybdenum H-ZSM5 catalyst preparation by in situ ultraviolet Raman spectroscopy
Autore:
Rzhevskii, AM; Choi, P; Ribeiro, FH; Gulotty, RJ; Olken, MM;
Indirizzi:
Worcester Polytech Inst, Dept Chem Engn, Worcester, MA 01609 USA WorcesterPolytech Inst Worcester MA USA 01609 n, Worcester, MA 01609 USA Dow Chem Co, Cent Res, Midland, MI 48674 USA Dow Chem Co Midland MI USA 48674 Chem Co, Cent Res, Midland, MI 48674 USA
Titolo Testata:
CATALYSIS LETTERS
fascicolo: 2-4, volume: 73, anno: 2001,
pagine: 187 - 191
SICI:
1011-372X(2001)73:2-4<187:MOMHCP>2.0.ZU;2-K
Fonte:
ISI
Lingua:
ENG
Soggetto:
ALUMINA CATALYSTS; SURFACE-STRUCTURES; OXIDE CATALYSTS; GAMMA-ALUMINA; MO; REDUCTION; MOLYBDATE; METHANE;
Keywords:
UV Raman spectroscopy; molybdenum oxide; ZSM5;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
19
Recensione:
Indirizzi per estratti:
Indirizzo: Ribeiro, FH Worcester Polytech Inst, Dept Chem Engn, 100 Inst Rd, Worcester, MA 01609 USA Worcester Polytech Inst 100 Inst Rd Worcester MA USA 01609 USA
Citazione:
A.M. Rzhevskii et al., "Monitoring of molybdenum H-ZSM5 catalyst preparation by in situ ultraviolet Raman spectroscopy", CATAL LETT, 73(2-4), 2001, pp. 187-191

Abstract

In situ ultraviolet Raman spectroscopy was used to follow the preparation of Mo/H-ZSM5 catalysts by thermal treatment of a physical mixture of MoO3 and H-ZSM5. The Raman spectra recorded from 300 to 1800 cm(-1) during the thermal treatment showed that MoO3 spread over the zeolite support to form dispersed molybdenum oxide species. Curve-fitting analysis of the overall spectral profile for the samples after treatment at 600 degreesC in O-2 showedthe presence of three spectral components at 962. 868 and 815 cm(-1) The band at 815 cm(-1) was assigned to the zeolite support. The most intense band at 962 cm(-1) could be attributed to terminal Mo=O groups of isolated tetrahedrally coordinated monomers and the weaker band at 868 cm-l to bridgingMo-O-Mo groups of dimeric species. These last two assignments are not definitive and may be due to other unique structures of oxides of molybdenum onthe zeolite framework.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 19/09/20 alle ore 10:29:14