MCM-41의 최적 합성조건에 관한 연구

Abstract

MCM-41 is synthesized with Cab-O-Sil M5(fumed silica), a kind of oligomeric silicate, in the absence of organic base or organic silicate. Cetyltrimethylammonium bromide is used as a template and sodium hydroxide is used as base. The effect of the change of the composition of reaction mixture on the synthesis of MCM-41 is studied by changing the composition of the reaction mixture independently. The synthesis variables are the molar ratios of OH/Si, surfactant/Si, H₂O/Si, and OH/Si under constant OH/H₂O molar ratio. The molar ratios of OH/Si and surfactant/Si exert crucial influences on the synthesis of MCM-41. The optimum values of the molar ratio of OH/Si and surfactant/Si are 0.3 and 0.27, respectively. The value of H₂O/Si also influences on the stability of the MCM-41. The smaller value results in good stability of the product in case of the complete mixing of the reaction mixture. In addition, the stoichiometric ratio between the reactants is more important in the synthesis than the ionic strength of the reaction mixture.