Influencing factors on rapid crystallization of high silica nano-sized zeolite Y without organic template under atmospheric pressure

摘要

Nano-sized zeolite Y has been successfully synthesized within 4-7 h of crystallization at 100 ℃ at atmospheric pressure through the optimization of molar composition using 2~3 factorial methods. The smallest crystal size of zeolite Y was in the range of 150-200 nm with the reaction time of 3 hrs to 4 hrs. However, solid state Si~(29)-nmr clearly shows that as aging time increases, Al seems to be more incorporated into silicate framework. Like the conventional zeolite synthesis, the alkalinity plays a critical role in the aspect of controlling the crystal size but the other two, Al_2O_3 and H_2O contents must be considered simultaneously. Therefore, the 2~3 factorial methods can be a useful tool for the optimization of molar composition to synthesize nano-sized zeolite Y crystals.