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Titolo:
Synthesis, characterization and catalytic testing of a 3-D mesoporous titanosilica, Ti-TUD-1
Autore:
Shan, Z; Jansen, JC; Marchese, L; Maschmeyer, T;
Indirizzi:
Delft Univ Technol, DelftChemTech, NL-2628 BL Delft, Netherlands Delft Univ Technol Delft Netherlands NL-2628 BL 28 BL Delft, Netherlands Univ Piemonte Orientale, Dipartimento Sci & Tecnol Avanzate, I-15100 Alessandria, Italy Univ Piemonte Orientale Alessandria Italy I-15100 100 Alessandria, Italy
Titolo Testata:
MICROPOROUS AND MESOPOROUS MATERIALS
fascicolo: 1-3, volume: 48, anno: 2001,
pagine: 181 - 187
SICI:
1387-1811(20011101)48:1-3<181:SCACTO>2.0.ZU;2-0
Fonte:
ISI
Lingua:
ENG
Soggetto:
MOLECULAR-SIEVES; TITANIUM SILICATE; UV-VIS; MCM-41; OXIDATION; TITANATRANES; STABILITY; TI-MCM41; TI;
Keywords:
epoxidation; mesoporosity; non-surfactant; template synthesis; titanosilica;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
24
Recensione:
Indirizzi per estratti:
Indirizzo: Shan, Z Delft Univ Technol, DelftChemTech, Julianalaan 136, NL-2628 BL Delft, Netherlands Delft Univ Technol Julianalaan 136 Delft Netherlands NL-2628 BL s
Citazione:
Z. Shan et al., "Synthesis, characterization and catalytic testing of a 3-D mesoporous titanosilica, Ti-TUD-1", MICROP M M, 48(1-3), 2001, pp. 181-187

Abstract

An active and stable mesoporous titanosilica, denoted as Ti-TUD-1, has been synthesized using a cheap, small and multifunctional chemical, triethanolamine (TEA), instead of surfactants. TEA not only is applied as a mesopore template and as a director of positioning Ti-sites onto the internal mesopore surface via the formation of titanium-TEA complexes, but also stabilizestitanium sources, which ensures the possibility of forming isolated tetrahedrally coordinated Ti-sites. Ti-TUD-1 features three-dimensionally randomly connected mesopores with walls of about 2.5-4 nm in thickness. Its surface area can reach about 700-1000 m(2)/g and its pore sizes are tunable. After calcination at 1000 degreesC and boiling in water, it kept a high integrity, a high surface area and only a slight change in pore sizes occurred. UV-VIS spectra revealed that tetrahedrally co-ordinated Ti-sites are quite stable under thermal and hydrothermal treatments. It also showed about 5.6 times higher activity for cyclohexene epoxidation than the framework-substituted Ti-MCM-41 and similar activity compared to Ti-grafted MCM-41. (C) 2001 Elsevier Science B.V. All rights reserved.

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Documento generato il 07/04/20 alle ore 20:44:46