Synthesis, characterization and catalytic activity of manganese oxidic nano-particles

 
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1995 (EN)
Synthesis, characterization and catalytic activity of manganese oxidic nano-particles (EN)

Skordilis, C. S. (EN)

Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Χημείας (EL)
Skordilis, C. S. (EN)

Manganese oxidic nano-particles have been prepared via hydrolysis of a trinuclear manganese complex [Mn3O(CH3COO)(6)(pyr)(3)]ClO4. The obtained particles are amorphous and crystallize to Mn2O3 at T > 500 degrees C. Their BET specific surface area is 150-200 m(2) g(-1) at 200 degrees C > T > 400 degrees C and diminishes to 50 m(2) g(-1) at 500 degrees C and 10 m(2) g(-1) at 650-700 degrees C. The pore volume distribution of the particles heated at 200 degrees C shows a maximum at 5.5 nm while almost 95% of the pores lies between 4 and 12 nm. In SEM it seems that the obtained particles are almost spherical with diameter 0.1 - 0.2 mu m. The obtained particles are active for the N2O decomposition, which was used as a probe reaction, above 300 degrees C. Activation energies calculated assuming first order kinetics are around 100 kJ/mol. Comparison with other catalysts containing manganese in oxidic form, like perovskites, conventionally prepared manganese oxide by precipitation of Mn(OH)(2) and manganese oxidic nano-particles supported on clay, shows that the activity of the nano-particles, calculated either per unit mass or unit area of active phase, is higher as referred to the other systems. (EN)

n2o decomposition (EN)

Πανεπιστήμιο Ιωαννίνων (EL)
University of Ioannina (EN)

Preparation of Catalysts Vi (EN)

English

1995

<Go to ISI>://A1995BE35H00048

Elsevier (EN)



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