abstract
ZSM-5, mordenite, cancrinite and Y zeolites were successfully crystallized by the dry-gel conversion (DGC) without any
organic additive (or template), in which the crystal particles of ZSM-5, mordenite and Y zeolite were well controlled in the range of
ultra?ne size. With a molar ratio of SiO2/Al2O3 40, the pure ZSM-5 zeolite was obtained at 170 degree at the Na2O/SiO2 molar ratio
<0.2, but the pure mordenite was formed at 150 8C at the Na2O/SiO2 molar ratio >0.25. When the dry-gel with a composition of
5.0Na2O:Al2O3:5.0SiO2 was crystallized at 140 degree for 24 h, pure cancrinite phase was obtained. TEM images showed that thus-
crystallized zeolites c**isted of ultra?ne particles ranging 35–150 nm for ZSM-5, 50–200 nm for mordenite and 120–200 nm for
zeolite Y, respectively. Different from ZSM-5, mordenite and cancrinite zeolites, the DGC synthesis of Y zeolite required more
water in the dry-gel before crystallization.
这是一篇关于沸石合成的文章，点数虽不高，但也是我三年来的心血。不知道为了这一篇英文文章伤了多少的脑筋啊，感觉现在三年不是混过来的了，心里舒服点了。
Synthesis+of+ultrane+zeolites+by+dry-gel+conversion.pdf(753 KB)
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