Synthesis and microstructure of porous Mn-oxides

Autor: Mira Ristić, Svetozar Musić, Stanko Popović
Přispěvatelé: musić, Svetozar, Ristić, Mira, Krehula, Stjepko
Rok vydání: 2009
Předmět:
Zdroj: Journal of Molecular Structure. :243-247
ISSN: 0022-2860
DOI: 10.1016/j.molstruc.2008.10.005
Popis: Generally, porous metal oxides have various applications in catalysis, chromatography, separation environmental sensing, etc. The investigation of porous metal oxides is also important from the academic standpoint. The relationship between the synthesis and porosity of metal oxides were investigated. A different synthesis routes were used in the preparation of porous metal oxides, for example, sol-gel processing, sonochemistry, water-in-oil microemulsion processing etc. Influences of various templates on the formation of porous metal oxides were investigated. A control of porous microstructure (nanostructure) of metal oxides is not an easy task, because this property strongly depends on the synthesis route. Small variations in the synthesis route also change the porosity, as well as the size and geometrical shape of the particles. In the present work we are reporting new results in the synthesis of porous alpha-Mn2O3 and Mn3O4 particles. The porous Mn-oxide particles were synthesized by urea processing in conbination with thermal treatment of the precursor precipitated. The samples were characterized with XRD, FT-IR, DTA and FE SEM. Upon heating of the precursor at 600 oC, alpha-Mn2O3 particles containing nanopores (cheese-like) were obtained. Majority of nanopores varied from ~ 20 to 60 nm, and some were close to ~ 100 nm in size. alpha-Mn2O3 showed a strong twinning effect. At 1100 oC, a single crystal phase Mn3O4 particles were forming 3D structure.
Databáze: OpenAIRE
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