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 M<SUB>2</SUB>O/SiO<SUB>2 </SUB>(M: alkali metal ion) of 0.07-0.14, H<SUB>2</SUB>O/SiO<SUB>2 </SUB>of 15-42 and SiO<SUB>2</SUB>/Al<SUB>2</SUB>O<SUB>3 </SUB>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.
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