Abstract
Crystalline phases of titanium(IV) phosphate have been obtained from titanium(III) chloride in phosphoric acid solutions. The α-titanium phosphate synthesis is possible at low temperature (60–80 °C). γ-Titanium phosphate is obtained by reflux with very concentrated phosphoric acid in 3–5 hours by oxidation with O 2. The influence in these reactions of several factors (concentration of reagents, molar ratio P:Ti in the reaction mixture, temperature and reaction time) was studied. The α-titanium phosphate formation takes place in several steps through the sequential formation of amorphous titanium(IV) phosphate, γ-titanium phosphate and/or a semicrystalline titanium(IV) hydroxophosphate, Ti(OH) 2(HPO 4) · H 2O.
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