Double-mesopore silica moleculr sieves have been synthesized in strong acidic ethanol-water system using nonionic surfactant C13EO9 via sol-gel route. The pore diameter was mainly located at 2.56 and 13.95 nm respectively. The former relative small pore was proved to be packed ordering like that of MSU series molecular sieves, while the larger pore was packed disordering and it was formed by the aggregation of colloid partiles. The structure of the present double- pore molecular sieves was also characterized by XRD, TEM and nitrogen adsorption-desorption measuremnets. At the same time, preparations that without C13EO9 and replacing C13EO9 with CTAB were also carried out parallelly for comparison. The obtained amorphous silica gel prepared without surfactant and the molecular sieves prepared with CTAB were all proved to be single-pore distributed.

Key words: NON IONIC SURFACTANTS, SILICON DIOXIDE, MOLECULAR SIEVE, SOL-GEL PROCESS, X-RAY DIFFRACTION ANALYSIS, TEMPLATE AGENT