Method of preparing ZSM-5 using variable temperature without...

Details Method of preparing ZSM-5 using variable temperature without... Method of preparing ZSM-5 using variable temperature without...

2008-04-22

2008-04-22

Kim, Vickie (Department: 4116)

Chemistry of inorganic compounds

Zeolite

Aging to induce zeolite formation from inorganic mixture

C423S711000, C423SDIG022

Reexamination Certificate

active

07361328

ABSTRACT:
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/SiO2of 15-42 and SiO2/Al2O3of 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.

REFERENCES:
patent: 4257885 (1981-03-01), Grose et al.
patent: 4565681 (1986-01-01), Kühl
patent: 5089243 (1992-02-01), Thome et al.
patent: 5240892 (1993-08-01), Klocke
patent: 5254327 (1993-10-01), Martinez et al.

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