Preparation of mesoporous silica-pillared H+-titanosilicates

Abstract: H+-titanosilicate (H4Ti2Si8O22 ·4H2O), formed by proton ion exchange of layered titanosilicate JDF-L1 (Na4Ti2Si8O22 ·4H2O) produced intercalation compounds in DDA (dodecylamine)–TEOS (tetraethylorthosilicate) solution. H+-titanosilicate/DDA/TEOS intercalation compounds rapidly hydrolyzed in pure water to form siloxane-pillared H+-titanosilicates. Calcination of siloxane-pillared H+-titanosilicates for 5h at 500°C in air resulted in the formation of mesoporous silica-pillared H+-titanosilicate (SPT) derivatives. SPT derivatives exhibited refractions corresponding to a basal spacing of 4.16–4.32nm, a uniform pore size of 2.8–3.4nm, and a large surface area of 535–618m2/g. The structures and physical properties of SPT derivatives remained stable after heating for 5h at 700°C in air. These results indicate that DDA molecules have a decisive role in pore formation within SPT derivatives, because they act as a base catalyst and as a template, like surfactant micelles, during the hydrolysis of TEOS. [Copyright &y& Elsevier]