Synthesis, characterization and catalytic testing of a 3-D mesoporous titanosilica, Ti-TUD-1

Z. Shan, J. C. Jansen, L. Marchese, Th Maschmeyer

Risultato della ricerca: Contributo su rivistaArticolo in rivistapeer review

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 director of positioning Ti-sites onto the internal mesopore surface via the formation of titanium-TEA complexes, but also stabilizes titanium sources, which ensures the possibility of forming isolated tetrahedrally coordinated Ti-sites. 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 m2/g and its pore sizes are tunable. After calcination at 1000°C and boiling in water, it kept a high integrity, a high surface area and only a slight change in pore sizes occured. 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.

Lingua originaleInglese
pagine (da-a)181-187
Numero di pagine7
RivistaMicroporous and Mesoporous Materials
Volume48
Numero di pubblicazione1-3
DOI
Stato di pubblicazionePubblicato - nov 2001

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