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Preparation and Characterization of Bidimensional Zeolitic Structures Obtained from Synthetic Beidellite and Hydroxy-Aluminum Solutions

Published online by Cambridge University Press:  02 April 2024

A. Schutz ,
W. E. E. Stone ,
G. Poncelet  and
J. J. Fripiat
A. Schutz
Affiliation:
Groupe de Physico-Chimie Minérale et de Catalyse, Université Catholique de Louvain, Place Croix du Sud 1, B-1348 Louvain-la-Neuve, Belgium
W. E. E. Stone*
Affiliation:
Groupe de Physico-Chimie Minérale et de Catalyse, Université Catholique de Louvain, Place Croix du Sud 1, B-1348 Louvain-la-Neuve, Belgium
G. Poncelet
Affiliation:
Groupe de Physico-Chimie Minérale et de Catalyse, Université Catholique de Louvain, Place Croix du Sud 1, B-1348 Louvain-la-Neuve, Belgium
J. J. Fripiat*
Affiliation:
Groupe de Physico-Chimie Minérale et de Catalyse, Université Catholique de Louvain, Place Croix du Sud 1, B-1348 Louvain-la-Neuve, Belgium
*
1Section de Physico-Chimie Minérale (MRAC), Place Croix du Sud 1, B-1348 Louvain-la-Neuve, Belgium.
2University of Wisconsin-Milwaukee, Department of Chemistry, Milwaukee, Wisconsin 53201.
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Abstract

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Beidellite was synthesized hydrothermally from a noncrystalline gel at 320°C and 130 bar pressure. The beidellitic character of the product was verified by infrared spectroscopy on the NH4+-exchanged form. Intercalation was achieved with hydroxy-aluminum solutions having different OH/Al molar ratios. The solutions were investigated by several methods, including 27Al nuclear magnetic resonance. Essentially, two Al species were detected: monomelic Al and a polymerized form containing Al in four-fold coordination. This latter species was found to be selectively fixed in the interlamellar region, which resulted in a stable spacing of 18 Å at 110°C and 16.2 Å at 700°C. The pillared beidellites had specific surface areas of > 300 m2/g, mainly due to micropores. Both Brönsted and Lewis acid sites were evidenced by infrared spectroscopy using pyridine as a probe molecule.

Résumé

Résumé

Une beidellite obtenue par synthèse hydrothermale (320°C, 130 bar) à partir d'un gel précurseur et identifiée comme telle sur base des spectres infrarouges de la forme échangée à l'ammonium, a été pontée par des solutions hydroxy-aluminiques de rapports OH/Al différents. Les solutions de pontage ont été étudiées par différentes méthodes, dont la résonance magnétique nucléaire. Deux espèces d'aluminium, l'une monomérique, l'autre polymérique contenant de l'aluminium en coordination tétraédrique coexistent dans ces solutions. On a observé que l'espèce polymérique s'adsorbe préférentiellement dans l'espace interlamellaire, conférant à l’édifice un espacement de 18 Å à 120°C et de 16,2 Å après calcination à 700°C. La surface spécifique de ces beidellites pontées est de l'ordre de 300 m2/g. La spectrométrie infrarouge de la pyridine adsorbée décèle la présence des acidités Brönsted et Lewis.

Keywords

Acid sitesBeidelliteHydroxy-AlInfrared spectroscopyNuclear magnetic resonancePillaringSynthesis
Type
Research Article
Information
Clays and Clay Minerals , Volume 35 , Issue 4 , August 1987 , pp. 251 - 261
Copyright
Copyright © 1987, The Clay Minerals Society

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