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 a nd characterized by X-ray powder diffraction (XRD), N-2 adsorption-des orption, cyclohexane and water physical adsorption, scanning electron microscopy (SEM), transmission electron microscopy (TEM), thermogravim etric analyses (TGA), Fourier transform infrared (FTIR) and C-13 and S i-29 magic-angle spinning nuclear magnetic resonance (MAS NMR) spectro scopy. Both preparations yield mesoporous materials with narrow-pore-s ize distributions and somewhat similar physicochemical properties. How ever, 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 diff erent.