Effect of ammonium salts on hydrothermal synthesis of high-silica mordenite

被引：23

作者：

Lu, BW

Oumi, Y

Itabashi, K

Sano, T ^{[1
]}

机构：

[1] Japan Adv Inst Sci & Technol, Sch Mat Sci, Nomi, Ishikawa 9231292, Japan

[2] Tosoh Corp, Nanyo Res Lab, Yamaguchi 7468501, Japan

来源：

MICROPOROUS AND MESOPOROUS MATERIALS | 2005年 / 81卷 / 1-3期

关键词：

high-silica; mordenite; zeolite; direct hydrothermal synthesis; ammonium salts;

D O I：

10.1016/j.micromeso.2005.02.021

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

Effect of ammonium salts on the direct hydrothermal synthesis of high-silica mordenite (MOR) zeolite with tetraethylammonium hydroxide was investigated. The addition of NH4NO3 to the system restrained the formation of MFI zeolite and quartz, and accelerated the crystallization rate of high-silica MOR zeolite. The MOR zeolite synthesized with NH4NO3 was very poorer in framework defects as compared with sample obtained without NH4NO3 as indicated by IR and Si-29 MAS NMR techniques. It was also indicated by nitrogen adsorption study that the micropore and external surface areas of the MOR zeolites synthesized with ammonium salts are considerably larger than that of sample without ammonium salts. Under well-optimized conditions, the highly crystalline and pure MOR zeolite with a Si/Al ratio of approximate to 34 was successfully prepared by adding seed crystals and NaF as well as NH4NO3. (c) 2005 Elsevier Inc. All rights reserved.

引用

页码：365 / 374

页数：10

共 49 条

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