Pillared titanates: Titanium oxide of high surface area and porosity
Journal
Microporous Materials
Journal Volume
2
Journal Issue
3
Pages
185-196
Date Issued
1994
Author(s)
Abstract
Pillaring layered titanates with robust polyoxometallic oligomers is a route to prepare microporous titanium oxide. In addition to using the organic intercalated compounds as precursors, the pillaring reaction on this layered metal oxide with a high charge density was facilitated by using layered titanate of low crystallinity and small particle size, which was achieved by hydrolyzing TiCl4 in strong alkaline solution. The resultant compound had a formula close to that of layered trititanate, NaHTi3O7·2H2O. Both aluminium Keggin ions, formulated as [Al13O4(OH)24(H2O)12]7+, and hydroxyzirconium tetramer cations, formulated as [Zr4(OH)8(H2O)16]8+, were introduced into the interlayers of this layered titanate. The layered structure was retained up to 600°C for the alumina-pillared derivative, but only to 500°C for the zirconia-pillared derivative. The pillared samples had BET surface areas ≥ 150 m2/g and contained both micro- and mesopores. Many of the physicochemical properties of the compounds before and after pillaring were compared. Most of the characteristic properties of TiO2 were retained on the pillared derivatives. © 1994.
Type
journal article