SYNTHESIS AND CHARACTERIZATION OF HIGH-SILICA ZEOLITE-RHO PREPARED IN THE PRESENCE OF 18-CROWN-6 ETHER AS ORGANIC TEMPLATE

被引：65

作者：

CHATELAIN, T

PATARIN, J

FOUSSON, E

SOULARD, M

GUTH, JL

SCHULZ, P

机构：

[1] UHA,ENSCMU,MAT MIN LAB,CNRS,URA 428,MULHOUSE,FRANCE

[2] CRES,ELF ANTAR FRANCE,LYON,FRANCE

来源：

MICROPOROUS MATERIALS | 1995年 / 4卷 / 2-3期

关键词：

RHO-TYPE ZEOLITE; SYNTHESIS; 18-CROWN-6; NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY; N-HEXANE ADSORPTION; NH3; STD; HIGH-TEMPERATURE X-RAY DIFFRACTION;

D O I：

10.1016/0927-6513(95)00009-X

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

Pure high-silica RHO-type zeolite samples with a framework Si/Al molar ratio as high as 4.5 were prepared by using 18-crown-6 ether as an organic template from a starting aluminosilicate gel containing cesium cations. The solids were characterized by elemental analysis, scanning electron microscopy (SEM), X-ray diffraction (XRD) thermal analysis, solid-state nuclear magnetic resonance (NMR) spectroscopy and n-hexane adsorption. The NH3 stepwise thermal desorption (STD) curve of high-silica zeolite rho shows stronger acid sites than for a FAU-type material with similar Si/Al molar ratio. High-temperature XRD analyses performed on the protonated hydrated form of high-silica zeolite rho showed no framework flexibility, presumably because of a higher covalent character of the framework.

引用

页码：231 / 238

页数：8

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