Direct synthesis and post-oxidation of SBA-15 and MCM-41 functionalized with butenyl groups.

Abstract

Olefins and derivatives are interesting compounds to anchor onto the surface of silica supports since their reactivity allow to form a large variety of organic functionalities. In this work, the synthesis of mesostructured silicas (MCM 41 and SBA 15 type materials) functionalized with butenyl groups is studied through the use of post synthetic grafting or direct synthesis procedures. Results confirm the higher functionalization degree achieved in the final mesostructured materials when using direct synthesis procedures. Unlike MCM 41 materials, which become microporous when high organic content are attached on, SBA 15 type butenyl functionalized silicas keep the features of a mesoporous solid. Post synthetic and in-situ oxidations of butenyl groups during the preparation of the mesostructured silicas have been carried out using H2O2 as oxidant, leading to materials functionalized with glycol species attached to inorganic mesoporous materials, which are attractive to be used as supports for anchoring different catalytic species.