Pillaring of a lepidocrocite-like titanate with aluminium oxide and characterization

A layered lepidocrocite-like titanate was pillared with aluminium oxides vi a indirect stepwise intercalation. The interlayer space was expanded by n-h exylammonium or tetrabutylammonium cations prior to intercalation with alum inium Keggin ions (known as Al-13). The polyoxocation uptake increased with exchange reaction temperature as well as with molar ratios of mmoles of Al per gram of titanate in the starting solution. The crystallinity of the pi llared material was affected by the nature of the starting titanate. Calcin ation of the above material at 500 degrees C produced a titanate pillared w ith aluminium oxides in the interlayer space having a gallery height of abo ut 1.40 nm. The thermal stability and specific surface area were mainly dep endent upon the density of the pillars in the interlayer region. The pillar ed titanates had a specific surface area of about 200 m(2) g(-1). (C) 1999 Elsevier Science B.V. All rights reserved.