Mixed Platinum-manganese oxide catalysts for combustion of volatile organic compounds

FABIOLA N. AGUERO, BIBIANA P. BARBERO, MANUEL F.PEREIRA, JOSÉ L. FIGUEIREDO, LUIS E. CADÚS

INDUSTRIAL & ENGINEERING CHEMICAL RESEARCH

American Chemical Society (ACS)

Año: 2009 vol. 48 p. 2795 - 2800

0888-5885

Mixed platinum–manganese oxide catalysts were prepared by impregnation of supported manganese oxide catalysts with a chloroplatinic acid solution. Supported manganese oxide catalysts used as bare catalysts were prepared from different manganese precursors (nitrate and acetate) and with two manganese loadings. Supported pure platinum catalysts were also prepared as reference. The catalytic activity was evaluated in ethanol and toluene combustion. Considering separately the catalysts from the different manganese precursors, the catalytic activity increases with the increase of the platinum dispersion. The platinum dispersion was affected by the presence of the basic sites on the surface. Furthermore, at least two different platinum active sites exist on the surface. The sites corresponding to the direct platinum-Al2O3 interaction would be more active than those corresponding to the platinum-manganese oxide interaction. Finally, the catalytic tests in ethanol-toluene mixture combustion demonstrated that manganese plays a beneficial role avoiding the inhibition of toluene combustion, which is observed on pure platinum catalysts.