Studies in the Crystallization of Ferrierite (FER) Type Zeolites in Presence of Promoting Medium

被引：18

作者：

Ahedi, Ranjeet Kaur ^{[1
]}

Kotasthane, A. N. ^{[1
]}

机构：

[1] Natl Chem Lab, Catalysis Div, Pune 411008, Maharashtra, India

来源：

JOURNAL OF POROUS MATERIALS | 1997年 / 4卷 / 03期

关键词：

kinetics of ferrierite (FER) crystallization; influence of promoters; (29)Si NMR;

D O I：

10.1023/A:1009662817021

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

The zeolite Ferrierite (FER) was synthesized from the hydrogel containing template and promoting medium. The kinetic features of the ferrierite crystallization with varying SiO(2)/Al(2)O(3) ratio are reported. The apparent activation energies for nucleation (E(n)) and crystallization (E(c)) were evaluated applying the Arrhenius equation. The rates of both nucleation and crystallization have been found to increase significantly in the presence of promoters like ClO(4)(-), PO(4)(-3) and SO(4)(-2) oxyanions during hydrothermal synthesis. The significant enhancement of the FER crystal growth rate due to promoting medium has been attributed to its greater polarizing and rapid condensation ability of tetrasiloxy silane species [Si-(O-Si)(4)]. The crystalline FER products obtained from promoting medium were characterized by XRD, SEM, TG/DTA, IR, NMR and sorption techniques.

引用

页码：171 / 179

页数：9

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