METHOD OF PREPARING ZSM-5 USING VARIABLE TEMPERATURE WITHOUT ORGANIC TEMPLATE

摘要

Disclosed is a method of preparing ZSM-5 having substantially 100% crystallinity by using variable temperatures in the absence of an organic template, characterized in that a reaction mixture having a molar composition of M₂O/SiO₂ (M: alkali metal ion) of 0.07-0.14, H₂O/SiO₂ of 15-42 and SiO₂/Al₂O₃ of 20-100 is nucleated at relatively high temperatures (180-210� C.) and then crystallized at relatively low temperatures (130-170� C.), thus easily controlling a crystal size and a particle size distribution of the ZSM-5.