Premium
One‐Step Synthesis of a Highly Active, Mesoporous, Titanium‐Containing Silica by Using Bifunctional Templating
Author(s) -
Shan Z.,
Gianotti E.,
Jansen J. C.,
Peters J. A.,
Marchese L.,
Maschmeyer T.
Publication year - 2001
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/1521-3765(20010401)7:7<1437::aid-chem1437>3.0.co;2-m
Subject(s) - triethanolamine , mesoporous material , calcination , titanium , bifunctional , catalysis , materials science , mesoporous silica , fourier transform infrared spectroscopy , chemical engineering , inorganic chemistry , chemistry , organic chemistry , metallurgy , analytical chemistry (journal) , engineering
Abstract 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.