Organic-functionalized molecular sieves (OFMSs): I. Synthesis and characterization of OFMSs with polar functional groups
Organic-functionalized molecular sieves that contain polar functional groups are synthesized and characterized. Small, uniform-sized crystals with the BEA topology are obtained when tetraethylammonium fluoride is used as a structure-directing agent and added at the initiation of tetraethylorthosilicate/organosilane hydrolysis. An aminopropyl-functionalized material with the BEA topology is prepared and characterized by X-ray diffraction, solid-state NMR spectroscopy, Raman spectroscopy and diffuse reflectance ultraviolet–visible spectroscopy. The results indicate that the aminopropyl groups are located within the intracrystalline void space and that they can be reacted with aldehydes to form occluded imines.
© 1999 Elsevier Science B.V. Received 5 October 1998, Accepted 10 December 1998, Available online 23 June 1999. Financial support for the work was provided by Akzo Nobel. The authors thank Osamu Chiyoda for performing the cyclohexane adsorption experiments. K.T. thanks Showa Denko K.K. for the opportunity to study at Caltech.