Functionalized MCM-41 and CeMCM-41 materials synthesized via interfacial reactions

A procedure of the template displacement by organosilanes was utilized to p repare pure-silica and cerium-substituted mesoporous materials with tailore d surface functionality. These two self-assembled mesostructured systems ex hibit hexagonal arrangement of mesopores but they show different reactivity with respect to organosilanes. Several samples with different pore size an d functionality were prepared and for the first time a cerium-substituted m esostructured silicate was functionalized. Some peculiarities of organosila ne interactions with the self-assembled cerium-substituted silicates reflec t the difference in the acidic and coordination properties of cerium center s in the mesostructure. The study of the template displacement kinetics sho ws that about 4 h are needed to remove 70% of surfactant and about twice lo nger time is required for its complete removal. In addition, it is shown th at the template displacement procedure stabilizes the ordered mesoporous st ructures.