CRYSTALLIZATION KINETICS OF ZEOLITE ZSM-5

被引：49
|
作者：
MINTOVA, S [1 ]
VALTCHEV, V [1 ]
VULTCHEVA, E [1 ]
VELEVA, S [1 ]
机构：
[1] BULGARIAN ACAD SCI,INST APPL MINEROL,BU-1113 SOFIA,BULGARIA
来源：
ZEOLITES | 1992年 / 12卷 / 02期
关键词：
ZSM-5; CORRELATIONS; KINETICS;
D O I：
10.1016/0144-2449(92)90086-5
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Zeolite ZSM-5 was synthesized from aluminosilicate gels in the presence of organic templates - tetrapropylammonium bromide (TPABr) and pyrrolidine (Py) - at temperatures of 423, 438 and 453 K. Nucleation and crystallization processes were subjected to a detailed kinetic analysis. The nucleation region is subdivided into two periods: induction and transition ones. Values of nucleation energy and crystallization energy, preexponential factor, rate of crystallization, and geometric factor have been calculated. Correlations between the estimated kinetic characteristics were found. The activation energy and the preexponential factor for the transitional and crystal-growth periods have the character of a kinetic compensation effect. The mechanism of the crystallization process is discussed on the basis of the kinetic features and correlations.
引用
收藏
页码：210 / 215
页数：6
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