Abstract

CASTANO, María Haidy; MOLINA, Rafael  and  MORENO, Sonia. Self-combustion and Co-precipitation manganese catalysts and their use in the oxidation of 2-propanol. Rev. acad. colomb. cienc. exact. fis. nat. [online]. 2015, vol.39, n.150, pp.26-35. ISSN 0370-3908.

Manganese mixed oxides were synthesized by self-combustion and co-precipitation, maintaining constant the relationship Mn²⁺/Mg²⁺ = 1 and M²⁺/M³⁺ = 3, which are characteristic of the oxides obtained by thermal decomposition of hydrotalcite-like precursors. The catalysts were characterized using X-ray fluorescence (XRF), X-ray diffraction (XRD), scanning electron microscopy (SEM), N₂ adsorption, and temperature-programmed reduction, and they were evaluated in the catalytic oxidation of 2 -propanol. The results showed that the use of such self-combustion synthesis method allows generating oxides with structural, textural, redox and catalytic properties similar to those obtained for the oxide prepared via a hydrotalcite-like precursor. The catalytic performance of mixed oxides was directly related to their redox properties. We evaluated the manganese oxide obtained by self-combustion deposited on Fecralloy metal monoliths, as well as the effect of the adhesion of the active phase of the precoat materials using colloidal alumina. The oxidation of 2-propanol over the monolith showed that there is no loss of activity when a catalyst is on a structured material.

Keywords : Hydrotalcite; self-combustion; co-precipitation; monolith; VOC.

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