The formation of large zeolite single crystals can be achieved by cont
rolling the factors affecting the crystallization process. A review of
several major strategies for the synthesis of large zeolite single cr
ystals based on our studies is presented. Through the addition of a nu
cleation suppresser to the reaction mixture and optimization of the sy
nthesis conditions, pure uniform large single crystals of LTA and FAU(
X) are obtained. Large single crystals of MOR, MFI and BET are prepare
d using the 'two-silicon source' technique. In the presence of fluorid
e, a large number of single crystals including silicalite-I, B-, Ti-MF
I, AlPO4-5, -11, -34, GaPO4, and InPO are promoted. It is found that a
clear homogeneous solution favors the crystallization of large single
crystals of AFI. The alcoholic synthesis route has proved to be one o
f the most effective ways to obtain large single crystals of some zeol
ites and metal phosphates. (C) 1998 Elsevier Science B.V. All rights r
eserved.