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Clays and Clay Minerals; February 2000; v. 48; no. 1; p. 1-9
© 2000 Clay Minerals Society
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STRUCTURAL MODEL OF Al13-PILLARED MONTMORILLONITE

Virgil I. Dimov, Albena V. Ilieva, Nelly G. Khaltakova and Liudmila D. Filizova

Central Laboratory of Mineralogy and Crystallography, Bulgarian Academy of Sciences, 1000 Sofia, Bulgaria

E-mail of corresponding author: mincryst{at}bas.bg

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.

Key Words: Alumina Pillaring • Computer Simulation • Keggin Pillaring • Montmorillonite • Structural Model • Transmission Electron Microscopy






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