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

• Published in: The Journal of physics and chemistry of solids 2017-04, Vol.103, p.22-32
• Main Authors: Schmit, F., Bois, L., Chiriac, R., Toche, F., Chassagneux, F., Descorme, C., Besson, M., Khrouz, L.
• Format: Article
• Language: English
• Subjects: Catalysis; Chemical Sciences; Crystallites; Environment and Society; Environmental Sciences; Hydrothermal crystal growth; Nanomaterials; Oxides; Segregation
• ISSN: 0022-3697; 1879-2553
• DOI: 10.1016/j.jpcs.2016.11.025

Mixed cerium manganese oxides were synthesized using a polyvinylpyrrolidone (PVP) assisted solvothermal method. Materials obtained after calcination at 400°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 100nm porous snowflakes, were successfully synthesized. These snowflakes were formed from the aggregation of smaller oriented crystallites (size 4nm). The hydrothermal stability of these materials was also investigated. [Display omitted] •Mixed manganese cerium oxides were synthesized, with polyvinylpyrrolidone as capping ligand.•Micrometric spheres were formed from aggregation of 100nm diameter porous snowflakes.•Snowflakes were formed from aggregation of 4nm Mn-Ce oxides oriented crystallites.•For Mn:Ce ratio increasing, the ceria crystallites orientation decreased.