Revision of Charnell's procedure towards the synthesis of large and uniform crystals of zeolites A and X

被引：31

作者：

Yang, XB ^{[1
]}

Albrecht, D ^{[1
]}

Caro, E ^{[1
]}

机构：

[1] Leibniz Univ Hannover, Inst Phys Chem & Elektrochem, D-30167 Hannover, Germany

来源：

MICROPOROUS AND MESOPOROUS MATERIALS | 2006年 / 90卷 / 1-3期

基金：

英国工程与自然科学研究理事会;

关键词：

growth of large crystals; zeolite A; zeolite X; Charnell's procedure; triethanolamine additive; optimized synthesis;

D O I：

10.1016/j.micromeso.2005.10.044

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

A critical replication and re-evaluation of Charnell's procedure to the synthesis of zeolites A and X has been carried out, aiming at reliable protocols for preparation of large and uniform crystals of the respective zeolites in a scale of 50 g per batch. Triethanolamine, as an organic additive to the reacting sodium aluminosilicate hydrogel, increases the viscosity of the system, and reduces the reactivity of aluminium species towards nucleation and crystal growth through forming chelated complex compounds. The reactivity of silicate species has to be accordingly adjusted, by choosing proper source materials. Zeolite A crystals.. which possess shapes of edge-truncated cubes, and sizes of 35-40 mu m in edge-length, have been synthesized with a starting gel having the composition 1.7Na(2)O:Al2O3:0.7-SiO2:165H(2)O:6.1TEA in 2-1 batch-size, using dissolved metallic aluminium and colloidal silica. The crystallization has been accomplished at 85 degrees C within 21 days. When the gel has a starting composition 2.3Na(2)O:Al2O3:1.3SiO(2):300H(2)O:10TEA (1-1 batch), 70-80 mu m large zeolite X crystals can be obtained at 85 degrees C in 35 days. Both starting gels are prepared at 0 degrees C, then quickly heated to the crystallization temperature. (c) 2005 Elsevier Inc. All rights reserved.

引用

页码：53 / 61

页数：9

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