SYNTHESIS AND CHARACTERIZATION OF MESOPOROUS ALUMINOSILICATES AI-MCM- 41 AND INVESTIGATIONOF ITS THERMAL, HYDROTHERMALAND ACIDITYSTABILITY

ABSTRACT The synthesis and characterization of mesoporous aluminosilicates AI-MCM-41 and the investigation of its thermal, hydrothermal and acidity stability have been done. AI-MCM-41 were synthesized by hydrothermal method to the mixture of sodium silicate as Si source, aluminium hydroxide as AI source, sodium hydroxide as a solvent, and cethyltrimethylammoniumbromide(CTAS) as structure directing agent. The reaction were carried out in alkaline condition (pH = 10.2) at 383 K for about 24 h, followed by calcination at 723 K for about 10 h. The synthesized crystals were characterized using FTiR spectroscopy, X-ray diffraction and Nz fisisorption methods. The result showed that AI-MCM-41 sample with hexagonal structure was formed, it has a good in thermal and acid stability, but the structure disintegratedin an alkaline solution (pH = 10)and in boiled water.. Keywords: synthesis, characterization,AI-MCM-41,stabilit