Oxidos de manganeso del tipo tamices moleculares octaedricos (OMS) como catalizadores para la eliminación de compuestos organicos volatiles

LAMAITA LUCIANO, MIGUEL PELUSO, GAMBARO LUIS, PRONSATO ESTELA, SAMBETH JORGE, THOMAS HORACIO

Santa Fe Argentina

Congreso; XIV Cong. Argentino de Catalisis; 2005

INCAPE - INTEC

Resumen Resumen Una serie de óxidos de manganeso han sido utilizados como catalizadores para la oxidación de Compuestos Orgánicos Volátiles (COVs). Los MnOx fueron sintetizados por la reducción de KMnO4 con Mn(NO3)2. Los sólidos obtenidos fueron calcinados a 350 y 500 °C y caracterizados mediante DRX, XPS y SEM. Los catalizadores fueron testeados en la reacción de oxidación total de etanol a CO2 y H2O. Los resultados señalan que los catalizadores calcinados a 350 °C tienen una mayor actividad que los calcinados a 500 °C. Esta mayor actividad podría ser debida a la presencia simultánea de los cationes Mn+3 y Mn+4. Asimismo, se ha encontrado que los catalizadores poseen una gran estabilidad con el tiempo en la oxidación de etanol. Los estudios de adsorción de etanol mediante las técnicas de DRIFTs "in situ" y TPRS permiten determinar la presencia de dos sitios diferentes de adsorción del alcohol. Abstract. Manganese oxides have been utilized as catalysts for Volatile Organic Compounds (VOCs) oxidation. In this study manganese oxides catalysts were prepared by reduction of KMnO4 with Mn(NO3)2. The solids were calcinated at 350 and 500°C. Characterization of MnOx has been done using XRD, XPS and SEM. The catalysts were tested in the complete oxidation of ethanol to carbon dioxide and water. The results showed that excellent activity and stability of MnOx calcinated at 350ºC are due to the simultaneous presence of Mn +3 and Mn+4 ions. Adsorption studies by "in situ" DRIFT spectroscopy and TPRS demonstrated the existence of two different sites of ethanol adsorption in both catalysts, MK1-350 and MK2-350. Abstract. Manganese oxides have been utilized as catalysts for Volatile Organic Compounds (VOCs) oxidation. In this study manganese oxides catalysts were prepared by reduction of KMnO4 with Mn(NO3)2. The solids were calcinated at 350 and 500°C. Characterization of MnOx has been done using XRD, XPS and SEM. The catalysts were tested in the complete oxidation of ethanol to carbon dioxide and water. The results showed that excellent activity and stability of MnOx calcinated at 350ºC are due to the simultaneous presence of Mn +3 and Mn+4 ions. Adsorption studies by "in situ" DRIFT spectroscopy and TPRS demonstrated the existence of two different sites of ethanol adsorption in both catalysts, MK1-350 and MK2-350.