Mesoporous molecular sieves MCM-48 were hydrothermally synthesized by using tetraethylorthosilicate (TEOS) as silica source and mixed surfactants of cetyltrimethylammonium bromide (CTAB) and Triton X-100 (TX-100) as co-template. The yields and hydro-thermal stability of MCM- 48 could be increased considerably by adjusting the pH values of the solutions which had been statically crystallized for a certain time. At the same time, the utilizing efficiency of the mixed surfactants was higher than that using CTAB alone as the template. The synthesized samples were characterized by XRD, N2 adsorption-desorption isotherms and FT-ffi methods.

Key words: TEOS, CTAB, HYDRO-THERMAL REACTION, TEMPLATE AGENT, XRD, ADSORPTION, DESORPTION, FT, IR