STUDIES ON ORDERED MESOPOROUS MATERIALS .3. COMPARISON OF MCM-41 TO MESOPOROUS MATERIALS DERIVED FROM KANEMITE

MCM41 and mesoporous materials derived from kanemite are synthesized and characterized by X-ray powder diffraction (XRD), N-2 adsorption-desorption, cyclohexane and water physical adsorption, scanning electron microscopy (SEM), transmission electron microscopy (TEM), thermogravimetric analyses (TGA), Fourier transform infrared (FTIR) and C-13 and Si-29 magic-angle spinning nuclear magnetic resonance (MAS NMR) spectroscopy. Both preparations yield mesoporous materials with narrow-pore-size distributions and somewhat similar physicochemical properties. However, due to a higher degree of condensation in the silicate walls of the materials derived from kanemite, these samples have higher thermal and hydrothermal stability than MCM-41. Additionally, the mechanisms by which these two types of materials are formed are dramatically different.