Critical Factors in the Seed-Assisted Synthesis of Zeolite Beta and "Green Beta" from OSDA-Free Na+-Aluminosilicate Gels

被引：165

作者：

Kamimura, Yoshihiro ^{[1
]}

Chaikittisilp, Watcharop ^{[1
]}

Itabashi, Keiji ^{[1
]}

Shimojima, Atsushi ^{[1
]}

Okubo, Tatsuya ^{[1
]}

机构：

[1] Univ Tokyo, Dept Chem Syst Engn, Bunkyo Ku, Tokyo 1138656, Japan

来源：

CHEMISTRY-AN ASIAN JOURNAL | 2010年 / 5卷 / 10期

基金：

日本学术振兴会;

关键词：

aluminosilicates; crystal growth; green chemistry; organic structure-directing agents; zeolites; TEMPLATE-FREE SYNTHESIS; DRY GEL; CRYSTALLIZATION BEHAVIOR; HYDROTHERMAL SYNTHESIS; WATER-RESISTANT; CARBON-MONOXIDE; MAS NMR; ACID; TSCHERNICHITE; FLUORIDE;

D O I：

10.1002/asia.201000234

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Organic structure-directing agent (OSDA)-free synthesis of zeolite beta is a subject of both scientific and industrial interest. Herein, we report a comprehensive investigation into the effects of various parameters on the seed-assisted crystallization of zeolite beta in the absence of OSDA. The crystallization behavior of "OSDA-free beta" is strongly governed by the chemical composition of the starting Na+-aluminosilicate gel as well as by the Si/Al ratios of the calcined beta seed crystals, which are prepared using tetraethylammonium hydroxide (TEAOH). Furthermore, OSDA-free beta seed crystals can be used to form zeolite beta, termed "green beta". XRD, scanning electron microscopy, inductively coupled plasma atomic emission spectroscopy, and Al-27 magic angle spinning NMR analyses showed that the OSDA-free beta and green beta were of high purity and crystallinity. The nitrogen adsorption-desorption of OSDA-free beta and green beta revealed higher surface areas and larger volumes in the micropore region than those of the beta seeds synthesized with OSDA after calcination. These results provide a robust and reliable process for the environmentally friendly production of high-quality zeolite beta in a completely OSDA-free Na+-aluminosilicate system.

引用

页码：2182 / 2191

页数：10

共 51 条

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