Preparation of nanodispersed titania using stabilized ammonium nitrate melts

M. Raciulete (1) , A. Kachina (1) , E. Puzenat (1) , P. Afanasiev (1)

1 IRCELYON - Institut de recherches sur la catalyse et l'environnement de Lyon

An expedite one-step approach using simple precursors has been proposed to obtain metallic oxide compounds and exemplified by preparation of highly dispersed TiO2. The technique consists in heating to 400-500 degrees C of molten ammonium nitrate stabilized with an organic nitrogen-containing compound (urea, melamine, ammonium oxalate) and containing dissolved metal salt precursor (TiOCl2). The crystallites of the resulting TiO2 demonstrated variable size and shape as a function of stabilizer used. Their activity in photocatalytic oxidation of formic acid also depends on the nature of the stabilizer. The catalysts as-prepared showed high photocatalytic performance, superior to that of the Degussa P25 reference. Nitrogen containing stabilizers play a double role of increasing the process safety and modifying the properties of the solid products. (C) 2010 Elsevier Inc. All rights reserved.

Domains: Catalysis; Environment and Society

M. Raciulete, A. Kachina, E. Puzenat, P. Afanasiev. Preparation of nanodispersed titania using stabilized ammonium nitrate melts. Journal of Solid State Chemistry, 2010, 183 (10), pp.2438-2444. ⟨10.1016/j.jssc.2010.07.049⟩. ⟨hal-00537361⟩