Synthesis of hydrothermally stable MCM-48 mesoporous molecular sieve at low cost of CTAB surfactant

Abstract: The hydrothermally stable MCM-48 mesoporous molecular sieve was successfully prepared at extremely low cost of cetyltrimethylammonium bromide (CTAB) by carefully adjusting the synthesis conditions. The increasing of the crystallization temperature from 373K to 423K can dramatically reduce the CTAB surfactant amount for the preparation of MCM-48 from 0.65 to 0.1 of the CTAB/Si ratio. The effect of increasing crystallization temperature on the formation process of MCM-48 at low CTAB cost was carefully studied. The influences of OH−/Si ratio and fluoride addition to the structure stability of the MCM-48 material synthesized at CTAB/Si=0.1 and 423K were systematically studied by XRD patterns. Moreover, the combination of increasing crystallization temperature and adding small amount of fluoride ions can considerably improve the structure stability of MCM-48 when reducing the CTAB cost. [Copyright &y& Elsevier]