Preparation and Properties of Pillared Interstratified Illite/Smectite

Johan Sterte
Department of Engineering Chemistry I, Chalmers University of Technology 412 96 Göteborg, Sweden

Abstract: Pillared, regularly and randomly interstratified illite/smectite (I/S) was prepared by interacting aluminum chlorohydrate with I/S in aqueous dispersion. I/S samples from Kinnekulle, Sweden, ranging in composition from 30–60% smectite layers, were used as starting clays. The pillaring resulted in a separation of the smectite layers in the I/S of about 9 Å, as estimated by X-ray powder diffraction and by nitrogen adsorption studies. Only the smectite layers of the clay were modified by the pillaring procedure. The pillared products had surface areas of 200–260 m2/g and pore volumes of about 0.18 cm3/g. The uptake of Al by the clay and the micropore surface area of the pillared products were proportional to the fraction of smectite layers in the I/S. The thermal and hydrothermal stability of the pillared I/S was similar to that of pillared montmorillonite prepared using the same procedure.

Key Words: Cross-linking • Illite/smectite • Pillaring • Smectite • Thermal stability • X-ray powder diffraction

Clays and Clay Minerals; December 1990 v. 38; no. 6; p. 609-616; DOI: 10.1346/CCMN.1990.0380606
© 1990, The Clay Minerals Society
Clay Minerals Society (www.clays.org)