Porous microspheres of manganese-cerium mixed oxides by a polyvinylpyrrolidone assisted solvothermal method

F. Schmit (1, 2) , L. Bois (2) , R. Chiriac (2) , F. Toche (2) , F. Chassagneux (2) , C. Descorme (3) , M. Besson (4) , L. Khrouz (5)

1 IRCELYON - Institut de recherches sur la catalyse et l'environnement de Lyon
2 LMI - Laboratoire des Multimatériaux et Interfaces
3 CARE - IRCELYON-Catalytic and Atmospheric Reactivity for the Environment
4 CDURABLE - IRCELYON-C'Durable
5 LC - Laboratoire de Chimie - UMR5182

Mixed cerium manganese oxides were synthesized using a polyvinylpyrrolidone (PVP) assisted solvothermal method. Materials obtained after calcination at 400 degrees C were characterized by X-ray diffraction, scanning and transmission electron microscopies, electron paramagnetic resonance (EPR), Raman spectroscopy, thermal analysis and nitrogen adsorption/desorption isotherms. The influence of the synthesis parameters on the oxide structure, such as the Mn:Ce ratio or the amount of PVP, was discussed. Micrometric spheres of mixed Mn-Ce oxides, resulting from the aggregation of 100 nm porous snowflakes, were successfully synthesized. These snowflakes were formed from the aggregation of smaller oriented crystallites (size 4 nm). The hydrothermal stability of these materials was also investigated.

Mots clés: Crystallites; Segregation; Hydrothermal crystal growth; Nanomaterials; Oxides

Domaines: Catalyse; Environnement et Société

F. Schmit, L. Bois, R. Chiriac, F. Toche, F. Chassagneux, et al.. Porous microspheres of manganese-cerium mixed oxides by a polyvinylpyrrolidone assisted solvothermal method. Journal of Physics and Chemistry of Solids, 2017, 103, pp.22-32. ⟨10.1016/j.jpcs.2016.11.025⟩. ⟨hal-01502102⟩