ON THE CRYSTALLIZATION MECHANISM OF ZEOLITE ZSM-5 .1. KINETIC COMPENSATION EFFECT FOR THE SYNTHESIS WITH SOME DIAMINES

Zeolite ZSM-5 was synthesized from the initial gel: 33 Na2O: 44R: Al2O 3: 100 SiO2: 4000 H2O: 25 H2SO4, where R is tetrapropylammonium bromid e (TPA) and C2, C3, C4, and C6 diamines are in the temperature range 4 23-453 K. The kinetic analysis of the crystallization of ZSM-5 permits us to follow the role of the used templates during the consecutive st eps of the process. The diminishing of the crystallization rate with t he increasing of the linear dimension of the molecule is proved. A kin etic compensation effect (KCE) was established between activation ener gy and the preexponential factor. The obtained KCE is proof for the un iform mechanism of crystallization of zeolite with C2, C3, C4, and C6 diamines and for a different one for the synthesis with TPA.