STUDY OF THE NATURE OF ACID SITES OF MONTMORILLONITES PILLARED WITH ALUMINUM AND OLIGOSILSESQUIOXANE COMPLEX CATIONS .1. BRONSTED ACIDITY

被引：21

作者：

ZUBKOV, SA ^{[1
]}

KUSTOV, LM ^{[1
]}

KAZANSKY, VB ^{[1
]}

FETTER, G ^{[1
]}

TICHIT, D ^{[1
]}

FIGUERAS, F ^{[1
]}

机构：

[1] ECOLE NATL SUPER CHIM MONTPELLIER,CHIM ORGAN PHYS & CINET CHIM APPL LAB,CNRS,URA 418,F-34053 MONTPELLIER 1,FRANCE

来源：

CLAYS AND CLAY MINERALS | 1994年 / 42卷 / 04期

关键词：

BRONSTED ACIDITY; DIFFUSE REFLECTANCE IR-SPECTROSCOPY; MONTMORILLONITES; PILLARED CLAYS;

D O I：

10.1346/CCMN.1994.0420407

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：

Two samples, obtained by pillaring a Wyoming montmorillonite with hydroxy aluminium and oligosilsesquioxane cations, were studied by stepwise thermal desorption of ammonia and by highly sensitive diffuse reflectance IR-spectroscopy. For both clays, the adsorption of ammonia shows a total number of acid sites equal to 0.35 meq/g, with acid strengths comparable to that of HY zeolites. By IR reflectance spectroscopy, Bronsted acid sites with an acid strength comparable to that of bridging hydroxyls in zeolites were found in Al samples but not on Si-montmorillonites. These sites were characterized by an overtone band at 7100 cm(-1) and an activity for ethylene oligomerization at 300 K.

引用

页码：421 / 427

页数：7

共 25 条

[1] IR STUDY OF BRONSTED ACIDITY OF AL-PILLARED MONTMORILLONITE [J].