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Study of the Nature of Acid Sites of Montmorillonites Pillared with Aluminium and Oligosilsesquioxane Complex Cations. 1. Brönsted Acidity

Published online by Cambridge University Press:  28 February 2024

S. A. Zubkov ,
L. M. Kustov ,
V. B. Kazansky ,
G. Fetter ,
D. Tichit  and
F. Figueras
S. A. Zubkov
Affiliation:
N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 117334, Moscow, Leninsky Pr. 47, Russia
L. M. Kustov
Affiliation:
N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 117334, Moscow, Leninsky Pr. 47, Russia
V. B. Kazansky
Affiliation:
N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 117334, Moscow, Leninsky Pr. 47, Russia
G. Fetter
Affiliation:
Laboratoire de Chimie Organique Physique et Cinétique Chimique Appliquées, URA 418 du CNRS, ENSCM, 8 Rue Ecole Normale - 34053 Montpellier Cedex 1, France
D. Tichit
Affiliation:
Laboratoire de Chimie Organique Physique et Cinétique Chimique Appliquées, URA 418 du CNRS, ENSCM, 8 Rue Ecole Normale - 34053 Montpellier Cedex 1, France
F. Figueras*
Affiliation:
Laboratoire de Chimie Organique Physique et Cinétique Chimique Appliquées, URA 418 du CNRS, ENSCM, 8 Rue Ecole Normale - 34053 Montpellier Cedex 1, France
*
*Present address: CNRS, 2 Avenue A, Einstein, 69626 Villeurbanne, France
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Abstract

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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, Brönsted 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.

Keywords

Brönsted acidityDiffuse reflectance IR-spectroscopyMontmorillonitesPillared clays
Type
Research Article
Information
Clays and Clay Minerals , Volume 42 , Issue 4 , August 1994 , pp. 421 - 427
Copyright
Copyright © 1994, Clay Minerals Society

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