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Preparation and Properties of Large-Pore La-Al-Pillared Montmorillonite

Published online by Cambridge University Press:  02 April 2024

Johan Sterte
Johan Sterte*
Affiliation:
Department of Engineering Chemistry I, Chalmers University of Technology, 412 96 Göteborg, Sweden
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Abstract

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Large-pore La-Al-pillared montmorillonite was prepared by reacting montmorillonite with hydrothermally treated mixtures of aluminum chlorohydrate and lanthanum chloride. The large-pore La-Al-pillared montmorillonite is characterized by basal spacings of about 26 Å, surface areas of 300–500 mVg, and pore volumes in the range 0.2–0.3 cm2/g. Large-pore pillared montmorillonite products were obtained from solutions refluxed for >72 hr or treated in autoclaves at 120°–160°C for 12–96 hr. The most favorable pillaring solution for the production of large-pore La-Al-pillared montmorillonite had an OH/Al ratio of 2.5, a La:Al ratio of 1:5, and was 2.5 M with respect to Al. The elemental composition of large pore La-Al-pillared montmorillonite is similar to that of a conventional Al-pillared montmorillonite that has a basal spacing of about 19 Å. The 26-Å spacing is believed to be associated with the formation of large polymeric La-bearing Al-cations upon hydrothermal treatment of the solutions.

Keywords

AluminumCross-linked smectiteLanthanumMontmorillonitePillared interlayer complexesX-ray powder diffraction
Type
Research Article
Information
Clays and Clay Minerals , Volume 39 , Issue 2 , April 1991 , pp. 167 - 173
Copyright
Copyright © 1991, The Clay Minerals Society

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