Combustión de compuesto orgánicos volátiles sobre óxido de manganeso soportado. Influencia del soporte, el precursor y la carga de manganeso.

FABIOLA N. AGÜERO, A. SCIAN, BIBIANA P. BARBERO, LUIS E. CADÚS

Brasil

Simposio; XX SICAT-Simpósio Ibero-Americano de Catálise 2006; 2006

  Se prepararon catalizadores de óxido de manganeso soportado sobre Al2O3 y un composite Mg-Al2O3 usando dos precursores diferentes (nitrato y acetato de manganeso) y dos cargas de manganeso. El comportamiento catalítico se evaluó en la combustión de etanol, que es un compuesto orgánico volátil empleado como solvente en las industrias de impresión y potencial combustible para automóviles. Los catalizadores más activos y selectivos a oxidación total fueron aquellos preparados desde acetato de manganeso. Mediante una amplia caracterización fisicoquímica por DRX, FRX, XPS, RTP, espectroscopia Raman, SEM y medición de superficie específica, se determinó que el mejor desempeño catalítico se obtiene cuando hay especies óxido de manganeso altamente dispersas sobre la superficie del catalizador. La formación de estas especies superficiales depende fuertemente del precursor de manganeso y en menor medida, del soporte y la carga de manganeso. Manganese oxide catalysts supported on Al2O3 and Mg-Al2O3 composite, were prepared from two different precursors, manganese acetate and manganese nitrate, with two manganese loadings. Catalytic performance was evaluated in ethanol combustion, which is a volatile organic compound used as solvent in print industries and a potential fuel for vehicles. The most active and selective catalysts to total oxidation were those prepared from manganese acetate. By means of a wide physicochemical characterization by XRD, XRF, XPS, TPR, Raman Spectroscopy, SEM, and specifics area measurements, it was found that the best catalytic performance was obtained when manganese oxide species are highly dispersed on the catalyst surface. The formation of these surface species depends mainly on the manganese precursor and also on the support and manganese loading. Manganese oxide catalysts supported on Al2O3 and Mg-Al2O3 composite, were prepared from two different precursors, manganese acetate and manganese nitrate, with two manganese loadings. Catalytic performance was evaluated in ethanol combustion, which is a volatile organic compound used as solvent in print industries and a potential fuel for vehicles. The most active and selective catalysts to total oxidation were those prepared from manganese acetate. By means of a wide physicochemical characterization by XRD, XRF, XPS, TPR, Raman Spectroscopy, SEM, and specifics area measurements, it was found that the best catalytic performance was obtained when manganese oxide species are highly dispersed on the catalyst surface. The formation of these surface species depends mainly on the manganese precursor and also on the support and manganese loading.