Effect of hydrothermal conditions on the synthesis of siliceous MCM-48 in mixed cationic-anionic surfactants systems

This work examines the effect of specific synthesis variables (i.e., the molar ratio of cationic to anionic surfactant, the carbon number of anionic surfactants, the concentration of the mixed surfactants, the molar ratio of mixed surfactants to SiO2, crystallization time and temperature) on the synthesis of siliceous MCM-48 (cubic, Ia3d), and obtains its suitable synthesis conditions when the micelles of mixed cetyltrimethylammonium bromide (CTMAB) and sodium carboxylate (SC) are used as templates. These results also show that different M41S-type mesoporous molecular sieves may be synthesized using the micelles of mixed CTMAB-SC as templates, which is complementary to the prevailing electrostatic and neutral templating routes.