DEALUMINATION OF LARGE CRYSTALS OF ZEOLITE ZSM-5 BY VARIOUS METHODS

被引：36

作者：

KORNATOWSKI, J

BAUR, WH

PIEPER, G

ROZWADOWSKI, M

SCHMITZ, W

CICHOWLAS, A

机构：

[1] NICHOLAS COPERNICUS UNIV,INST CHEM,PL-87100 TORUN,POLAND

[2] UNIV LEIPZIG,WISSENSCH BEREICH KRISTALLOG,O-7030 LEIPZIG,GERMANY

[3] POLISH ACAD SCI,INST ORGAN CHEM,PL-01224 WARSAW,POLAND

来源：

JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS | 1992年 / 88卷 / 09期

关键词：

D O I：

10.1039/ft9928801339

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：

Large crystals of ZSM-5 have been dealuminated by several methods in order to compare the effectiveness of the various treatments and their influence on the crystal structure. Any acidic treatment always leads to a partial dealumination of the aluminosilicate framework. The extracted aluminium cannot be completely removed from the crystals. Some of it remains inside the pores, presumably as aloxo compounds. The largest fraction of aluminium can be removed from the crystals of ZSM-5 by leaching with an acid followed by steaming and a subsequent final acid leaching. The steaming treatment apparently causes a re-ordering within the crystal structure by removing the framework vacancies by the T-jump mechanism. Ion exchange of Al3+ by using aqueous solutions of Al salts is impossible.

引用

页码：1339 / 1343

页数：5

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