THE ROLE OF THE BASIC SOURCE IN THE SYNTHESIS OF PURELY SILICEOUS MCM-41

In this present work, we studied the influence of the nature of the basic source on the structural and the textural of a mesoporous materials of type Si-MCM-41. Three basics source were selected: NaOH,TEAOH and TMAOH. These different bases were studied at various temperatures: 100, 130 and 150°C,for a duration of 48 hours by using the direct method. The characterization of the obtained samples was made by powder X-ray diffraction (XRD), N2 sorption and scanning electron microscopy (SEM). TheTMAOH led to mesoporous materials MCM-41 whose properties are most interesting: good organization of the channels, high SBET and Vmeso and very regular pore size distribution centered at 40Å. The analysis by N2-adsorption shows a reduction in the SBET when the temperature increases. In addition, the morphology developed by textured materials at low temperature is different from that developed at high temperature.