TY - JOUR
T1 - One-step synthesis of a highly active, mesoporous, titanium-containing silica by using bifunctional templating
AU - Shan, Z.
AU - Gianotti, E.
AU - Jansen, J. C.
AU - Peters, J. A.
AU - Marchese, L.
AU - Maschmeyer, T.
PY - 2001/4/1
Y1 - 2001/4/1
N2 - A highly active, three-dimensional, mesoporous titanosilica, Ti-TUD-1, with comparable properties to Ti-grafted mesoporous silica MCM-41, has been prepared in a one-step synthesis. A non-surfactant chemical, triethanolamine, was used as a template molecule. Triethanolamine easily forms complexes with titanium alkoxides, yielding titanatrane complexes, which together with free triethanolamine form meso-sized aggregates that template mesopores upon increasing the temperature of the synthesis mixture. Triethanolamine served as both mesopore template and ligand for the titanium complexes, which represent the majority of the catalytic-site precursors. The formation of the silica network and the titanium insertion were followed by a combination of diffuse reflectance UV/Vis/NIR and FTIR spectroscopy. A titanium-rich phase was obtained on the mesopore surfaces during calcination, allowing for easy accessibility of the reactants to the catalytic sites. Ti-TUD-1 is about six times more active than framework-substituted Ti-MCM-41 and has similar activity to Ti-grafted MCM-41.
AB - A highly active, three-dimensional, mesoporous titanosilica, Ti-TUD-1, with comparable properties to Ti-grafted mesoporous silica MCM-41, has been prepared in a one-step synthesis. A non-surfactant chemical, triethanolamine, was used as a template molecule. Triethanolamine easily forms complexes with titanium alkoxides, yielding titanatrane complexes, which together with free triethanolamine form meso-sized aggregates that template mesopores upon increasing the temperature of the synthesis mixture. Triethanolamine served as both mesopore template and ligand for the titanium complexes, which represent the majority of the catalytic-site precursors. The formation of the silica network and the titanium insertion were followed by a combination of diffuse reflectance UV/Vis/NIR and FTIR spectroscopy. A titanium-rich phase was obtained on the mesopore surfaces during calcination, allowing for easy accessibility of the reactants to the catalytic sites. Ti-TUD-1 is about six times more active than framework-substituted Ti-MCM-41 and has similar activity to Ti-grafted MCM-41.
KW - Complexation
KW - Epoxidation
KW - Mesoporous materials
KW - Template synthesis
KW - Titanosilica
UR - http://www.scopus.com/inward/record.url?scp=0035312379&partnerID=8YFLogxK
U2 - 10.1002/1521-3765(20010401)7:7<1437::AID-CHEM1437>3.0.CO;2-M
DO - 10.1002/1521-3765(20010401)7:7<1437::AID-CHEM1437>3.0.CO;2-M
M3 - Article
SN - 0947-6539
VL - 7
SP - 1437
EP - 1443
JO - Chemistry - A European Journal
JF - Chemistry - A European Journal
IS - 7
ER -