Resumen

PICASSO, Gino; QUIJANO, José  y  SUN KOU, Rosario. Synthesis of catalysts based on Co-Mn oxides for combustion of n-Hexane. Rev. Soc. Quím. Perú [online]. 2015, vol.81, n.4, pp.369-380. ISSN 1810-634X.

Catalytic combustion of n-hexane was studied over various mixed oxides based on Co-Mn by the redox properties of these materials. The catalysts were prepared by coprecipitation applying an aging time of 24h, from nitrate precursor of Co²⁺ and Mn²⁺ with molar Co/Mn ratios corresponded to 5; 2; 1; 0,5 and 0,2. The oxides were characterized by N₂ sorption (BET technique), X-ray diffraction (XRD), infrared Fourier transform spectroscopy (FTIR) and temperature programmed reduction (TPR). The isotherms of N₂-sorption were of type IV corresponded to micro-mesoporous material, with the presence of cilindric pores. X-ray analysis revealed the presence of mixed phases corresponding to spinel MnCo₂O₄ and tetragonal (CoMn)(CoMn)₂O₄. FTIR spectroscopy showed combined signals in the mixed samples, revealing metallic interaction. TPR analysis showed better reducibility in mixed samples in relation with the simple ones. The ignition curves for Co-Mn samples depicted better activities with the enrichment of Co compound in mixed samples, being the sample Co/Mn=5 the most efficiency, probably attributable to the best surface and the highest reducibility.

Palabras clave : Catalytic combustion; n-hexane; Co-Mn.

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