Abstract: HMS mesoporous molecular sieve was synthesized using dodecylamine (DDA) as a template and tetethylorthosilicalite (TEOS) as a silicon source. The effects of synthesis parameters such as pH, synthesis temperature and time, DDA/SiO₂, H₂O/SiO₂and EtOH/SiO₂molar ratio on the structure and particle size of HMS were investigated systematically. It is shown that the synthesis parameters have great influence on the structure and particle size of HMS. The ultrafine HMS mesoporous molecular sieve of 100～300 nm can be obtained under the condition of pH=7, DDA/SiO₂=0.27, H₂O/SiO₂=66.7, EtOH/SiO₂=6.5, reaction temperature 20 °C, and reaction time 18 h.

Key words: mesoporous molecular sieve, synthesis, ultrafine
, HMS