SYNTHESIS AND CHARACTERIZATION OF THE MESOPOROUS SILICATE MOLECULAR-SIEVE MCM-48

We have used powder X-ray diffraction, diffuse reflectance Fourier-tra nsform infrared, Si-29 MAS NMR, N-2 adsorption, and transmission elect ron microscopy to examine the role of the concentration of silica, the surfactant, and the reaction time in the synthesis of high-quality si lica mesoporous molecular sieve MCM-48, The XRD patterns of the produc ts are consistent with the hexagonal --> cubic --> lamellar phase tran sformation.