Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
The active sites in different TS-1 zeolites for propylene epoxidation studied by ultraviolet resonance Raman and ultraviolet visible absorption spectroscopies
Autore:
Zhang, FZ; Guo, XW; Wang, XS; Li, G; Zhou, JC; Yu, JQ; Li, C;
Indirizzi:
Dalian Univ Technol, Lab Comprehens Utilizat Carbonaceous Resources, Dalian 116012, Peoples R China Dalian Univ Technol Dalian Peoples R China 116012 16012, Peoples R China 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:
CATALYSIS LETTERS
fascicolo: 3-4, volume: 72, anno: 2001,
pagine: 235 - 239
SICI:
1011-372X(2001)72:3-4<235:TASIDT>2.0.ZU;2-C
Fonte:
ISI
Lingua:
ENG
Soggetto:
TITANIUM SILICALITE-1 TS-1; MFI; CATALYSTS;
Keywords:
titanium silicalite; UV-Raman spectroscopy; UV-Vis absorption spectroscopy; mononuclear and isolated TiOx; propylene epoxidation;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
21
Recensione:
Indirizzi per estratti:
Indirizzo: Zhang, FZ Tsing Hua Univ, Dept Chem, Beijing 100084, Peoples R China TsingHua Univ Beijing Peoples R China 100084 Peoples R China
Citazione:
F.Z. Zhang et al., "The active sites in different TS-1 zeolites for propylene epoxidation studied by ultraviolet resonance Raman and ultraviolet visible absorption spectroscopies", CATAL LETT, 72(3-4), 2001, pp. 235-239

Abstract

The titanium species in four kinds of titanium-containing MFI zeolites have been studied by ultraviolet (UV)-Raman and ultraviolet visible (UV-Vis) absorption spectroscopies and by the epoxidation of propylene with diluted H2O2 solution (30%). UV-Raman spectroscopy is proved to be a suitable means to estimate qualitatively the framework titanium in TS-l zeolites. Based onthe comparison of the relative intensity ratio I-1125/I-380 of UV-Raman spectra, the TS-1(conv.) sample synthesized hydrothermally by the conventional procedure shows the highest amount of framework titanium. UV-Vis spectroscopy reveals that besides minor anatase. titanium species are mainly tetrahydrally coordinated into the framework for TS-l(conv.) or the Ti-ZSM-5 sample prepared by gas-solid reaction between deboronated B-ZSM-5 and TiCl4 vapor at elevated temperatures. For the TS-1(org.) and TS-1(inorg.) samples synthesized hydrothermally using tetrapropylammonium bromide (TPABr) as template and tetrabutylorthotitanite (TBOT) and TiCl3 as titanium source, respectively, the presence of mononuclear and isolated TiOx species which are proposed to bond to the zeolite extraframework is observed. In addition to theframework titanium species, these isolated TiOx species are assumed to be also active for propylene epoxidation.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 09/08/20 alle ore 23:17:17