Molecular Simulations of Montmorillonite Intercalated with Aluminum Complex Cations. Part I: Intercalation with [Al13O4(OH)24+x(H2O)12−x](7−x)+

P. Čapková1, 2, R. A. J. Driessen1, M. Numan1, H. Schenk1, Z. Weiss3 and Z. Klika3
1 Laboratory of Crystallography, AIMS, University of Amsterdam, Nieuwe Achtergracht 166, 1018 WV Amsterdam, The Netherlands
2 Faculty of Mathematics and Physics, Charles University Prague, Ke Karlovu 5, 121 16 Prague, Czech Republic
3 Central Analytical Laboratory, Technical University Ostrava, 70833 Ostrava, Czech Republic

Abstract: The structure of montmorillonite intercalated with [Al13O4(OH)24+x(H2O)12−x](7−x)+ cations ( A l 13 (7−x)+ for short), where x = 0, 2 and 4, has been studied using the Cerius2 modeling environment. The Crystal Packer module used in the present study takes into account only the nonbonded interactions between the silicate layer and the Keggin cations. Minimization of the total sublimation energy led to the following conclusions: the structure of the interlayer (that is, the orientation of Keggin cations and the basal spacing) depends on the charge of cations (that is, on the degree of hydrolysis, x). The values of basal spacings in the range 19.38–20.27 Å have been obtained, depending on the charge and arrangement of cations in the interlayer. The dominating contribution to the total sublimation energy comes from the electrostatic interactions. Translations of A l 13 (7−x)+ cations along the 2:1 layers give only small fluctuations of the total sublimation energy and basal spacings. No preference for the position of A l 13 (7−x)+ cations in the interlayer of montmorillonite was found during translation along the 2:1 layers. This result confirmed the inhomogeneous distribution of cations in the interlayer and turbostratic stacking of layers.

Key Words: Al-Cations • Intercalation • Molecular Simulation • Montmorillonite • Structure

Clays and Clay Minerals; June 1998 v. 46; no. 3; p. 232-239; DOI: 10.1346/CCMN.1998.0460302
© 1998, The Clay Minerals Society
Clay Minerals Society (www.clays.org)