Abstract
Titanium alkyl phosphates (TiAP) synthesized by the reactions of Ti(SO 4) 2 with monohexyl, monooctyl, and monodecyl phosphates in aqueous media were characterized by various means. The XRD patterns of TiAP showed a strong diffraction peak and two weak ones below 2θ=15°. The TiAP particle prepared using octyl phosphate gave rise to the lattice patterns having uniform alternating spacings of ca. 0.7 and ca. 2.0 nm. When treated at 900°C, TiAP crystallized as TiP 2O 7. The chemical formula could be shown as (ROPO 3) 2Ti·0.44H 2O. These facts suggest that the TiAP is composed of a multilayer alternating bimolecular layer of alkyl phosphates and hydrated titanium phosphate phase. Alkyl groups in the layers were removed by outgassing above 300°C to give the materials having mesopores with a diameter of ca. 2 nm.
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