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Titolo:
Identifying framework titanium in TS-1 zeolite by UV resonance Raman spectroscopy
Autore:
Li, C; Xiong, G; Liu, JK; Ying, PL; Xin, Q; Feng, ZC;
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:
JOURNAL OF PHYSICAL CHEMISTRY B
fascicolo: 15, volume: 105, anno: 2001,
pagine: 2993 - 2997
SICI:
1520-6106(20010419)105:15<2993:IFTITZ>2.0.ZU;2-I
Fonte:
ISI
Lingua:
ENG
Soggetto:
CATALYTIC-OXIDATION; TI-SILICALITE; AB-INITIO; HYDROXYLATION; SILICATES; PHENOL; SITES; ADSORPTION; MOLECULES; SPECTRA;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
41
Recensione:
Indirizzi per estratti:
Indirizzo: Li, C Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China Chinese Acad Sci Dalian Peoples R China 116023 23, Peoples R China
Citazione:
C. Li et al., "Identifying framework titanium in TS-1 zeolite by UV resonance Raman spectroscopy", J PHYS CH B, 105(15), 2001, pp. 2993-2997

Abstract

Framework titanium in Ti-silicalite-1 (TS-1) zeolite was selectively identified by its resonance Raman bands using ultraviolet (W) Raman spectroscopy. Raman spectra of the TS-1 and silicalite-1 zeolites were obtained and compared using continuous wave laser lines at 244, 325, and 488 nm as the excitation sources. It was only with the excitation at 244 nm that resonance enhanced Raman bands at 490, 530, and 1125 cm(-1) appeared exclusively for the TS-1 zeolite. Furthermore, these bands increased in intensity with the crystallization time of the TS-1 zeolite. The Raman bands at 490, 530, and 1125 cm(-1) are identified as the framework titanium species because they only appeared when the laser excites the charge-transfer transition of the framework titanium species in the TS-1. No resonance Raman enhancement was detected for the bands of silicalite-1 zeolite and for the band at 960 cm(-1) of TS-1 with any of the excitation sources ranging from the visible tb UV regions. This approach can be applicable for the identification of other transition metal ions substituted in the framework of a zeolite or any other molecular sieve.

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Documento generato il 05/12/20 alle ore 02:00:53