Non isothermal decomposition of lanthanum titanates precursors prepared by sol gel process: A kinetic and thermodynamic study

S. Bassil (1) , A. Kaddouri (1) , B. Beguin (1) , P. Gelin (1)

1 ENERGIE - ENERGIE

The single phase La0.8Sr0.2TiO3+delta was prepared via the sol gel process using propionic acid. Kinetics of the thermal decomposition of the precursors has been studied using differential thermogravimetry under non-isothermal conditions in different atmospheres (air and helium). Non isothermal kinetic (A and Delta E) and thermodynamic parameters (Delta H, Delta S and Cp) were determined using different heating rates. La2O3, SrO and TiO2 products crystallized at temperatures of ca. 730, 960 and 470 degrees C respectively while pure La0.8Sr0.2TiO3+delta phase was obtained at 1200 degrees C, temperature substantially lower than that used for the preparation of La0.8Sr0.2TiO3+delta by conventional solid state method. Precursors and/or final solids were characterized by thermogravimetric analysis (TG), Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction, diffuse reflectance ultraviolet-visible spectroscopy (DR-UV-vis) and methane steam reforming under water deficient conditions. (C) 2013 Elsevier B.V. All rights reserved.

Domaines: Catalyse; Environnement et Société

S. Bassil, A. Kaddouri, B. Beguin, P. Gelin. Non isothermal decomposition of lanthanum titanates precursors prepared by sol gel process: A kinetic and thermodynamic study. Thermochimica Acta, 2013, 567, pp.35-39. ⟨10.1016/j.tca.2013.01.032⟩. ⟨hal-00861182⟩