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Structural Model of Al13-Pillared Montmorillonite

Published online by Cambridge University Press:  28 February 2024

Virgil I. Dimov ,
Albena V. Ilieva ,
Nelly G. Khaltakova  and
Liudmila D. Filizova
Virgil I. Dimov
Affiliation:
Central Laboratory of Mineralogy and Crystallography, Bulgarian Academy of Sciences, 1000 Sofia, Bulgaria
Albena V. Ilieva
Affiliation:
Central Laboratory of Mineralogy and Crystallography, Bulgarian Academy of Sciences, 1000 Sofia, Bulgaria
Nelly G. Khaltakova
Affiliation:
Central Laboratory of Mineralogy and Crystallography, Bulgarian Academy of Sciences, 1000 Sofia, Bulgaria
Liudmila D. Filizova
Affiliation:
Central Laboratory of Mineralogy and Crystallography, Bulgarian Academy of Sciences, 1000 Sofia, Bulgaria
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Abstract

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Alumina-pillared montmorillonite is prepared by intercalation of polyoxyhydroxy aluminum cations (Al137+) of a natural montmorillonite from Dimitrovgrad, Bulgaria. Transmission electron microscopy, powder X-ray diffraction, energy dispersive X-ray spectroscopy, and surface area (BET) methods are used to study the untreated and pillared forms of the montmorillonite. A structural model involving deformed Al13 pillars is proposed. Four pillar types are derived and these pillars are uniformly distributed over the interlayer-cation positions of montmorillonite. Calculated electron diffraction patterns were simulated using the multi-slice method. The structural model explains the increased ordering along the c axis of the pillared form compared with the untreated montmorillonite. The model explains the structure of a pillared montmorillonite with different distributions of the pillars in the interlayer. The proposed model is consistent with the observed data.

Keywords

Alumina PillaringComputer SimulationKeggin PillaringMontmorilloniteStructural ModelTransmission Electron Microscopy
Type
Research Article
Information
Clays and Clay Minerals , Volume 48 , Issue 1 , February 2000 , pp. 1 - 9
Copyright
Copyright © 2000, The Clay Minerals Society

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