Structure Organization of Aluminosilicate Polyanions with Surfactants: Optimization of AI Incorporation in Aluminosilicate Mesostructural Materials

摘要

Recently a new family of silicate-surfactant mesostructural materials, discovered by researchers at Mobil Corporation, has drawn considerable attention due to their potential applications as either highly ordered mesoporous molecular sieves, organic-inorganic nanocomposites or materials with biomimetic importance. One member of this family, designated MCM-41, has highly ordered mesoscopic channels in a hexagonal arrangement, whose size may be engineered to be greater than 100 A. For this type of mesoporous material to be practically useful as a catalyst, it is essential to incorporate a suitable amount of a metallic element into the silicate framework. The incorporation of vanadium or titanium oxides into the silicate framework of MCM-41 has been reported, and the resulting materials have been found to show promising activities in certain oxidation reactions. For the aluminosilicate MCM-41 materials, efforts have been made to increase the framework Al content by usins alternative aluminum sources,such as sodium aluminate or aluminum alkoxides, to replace pseudo-boehmite alumina which is commonly used in these syntheses.