Preparation and Properties of Pillared Clays with Controlled Pore Structures (Part 1)

Abstract

In the preparation of SiO2-TiO2 sol pillared clays, organic cations, octadecyltrimethylammonium, were added to a montmorillonite suspension, together with SiO2-TiO2 mixed sol solutions. The order of the addition was important; if the organic cations were added first, the effect of the addition was very small. On the other hand, if the SiO2-TiO2 sol solutions were added first, followed by the addition of the organic cations, a pillared clay with mesopores was obtained on calcination: the surface area increased with an increase in the amount of the addition of the organic cations. In the latter case, the organic cations probably occupy a part of the interlayer spaces of montmorillonite together with the sol particles and burning off the organic cations leaves behind mesopores in the interlayer spaces.