SYNTHESIS, CHARACTERIZATION, AND CATALYTIC PROPERTIES OF SILICA-RICH FAUJASITE-TYPE ZEOLITE (FAU) AND ITS HEXAGONAL ANALOG (EMT) PREPARED BY USING CROWN-ETHERS AS TEMPLATES

被引：113

作者：

DOUGNIER, F ^{[1
]}

PATARIN, J ^{[1
]}

GUTH, JL ^{[1
]}

ANGLEROT, D ^{[1
]}

机构：

[1] GRL,ELF AQUITAINE GRP,ARTIX,FRANCE

来源：

ZEOLITES | 1992年 / 12卷 / 02期

关键词：

HIGH-SILICA FAUJASITE (FAU); HEXAGONAL ANALOG (EMT); SYNTHESIS; SOLID-STATE MAS NMR SPECTROSCOPY; ACIDIC AND CATALYTIC PROPERTIES;

D O I：

10.1016/0144-2449(92)90078-4

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：

High silica faujasite (FAU) and its hexagonal analog (EMT) were synthesized using 15-crown-5 and 18-crown-6, respectively, as templating agents. By mixing these two crown-ethers in the starting hydrogel, a material with a crystal morphology resulting from an overgrowth of both cubic and hexagonal structures was obtained. These three zeolites with a Si/Al molar ratio close to 4 were ion-exchanged and transformed into their protonated forms. The samples were characterized by chemical analysis, Si-29, Al-27, and Na-23 solid-state MAS n.m.r., and it was shown that the sodium removal was more complete in the hexagonal and overgrown samples. The acidity (determined by STD of ammonia) and the catalytic activity (evaluated by n-heptane cracking) are closely related to the residual amount of Na+, and they proved to be higher for the two latter samples.

引用

页码：160 / 166

页数：7