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Influence of the Support Treatment on the Behavior of MnOx/Al2O3 Catalysts used in VOC Combustion

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Abstract

Alumina was treated with water and diluted nitric acid and then was used to prepare supported MnO x /Al2O3 catalysts with two different loadings. The influence of the support treatment on the catalytic behavior in ethanol and toluene combustion was studied. The treatments modified the alumina physicochemical properties (porosity, surface area, isoelectric point, and surface acidity). The modification of these properties affected the interaction of the manganese oxide species with the support and increased the dispersion of the active phase. Catalysts prepared from treated supports showed the best catalytic performance in ethanol combustion. At high manganese loading, this better catalytic performance was related to the high capacity for adsorbing oxygen. While at low manganese loading, the great amount of dispersed surface manganese oxide species and/or the existence of surface defects were relevant in the catalytic activity. On the other hand, the reactivity of the catalysts in toluene combustion was roughly correlated with the reducibility of the surface manganese oxide species. On the basis of these observations, we conclude that the ethanol combustion occurs by a suprafacial mechanism whereas the toluene combustion proceeds through an intrafacial mechanism.

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Acknowledgments

The financial support from UNSL, CONICET and ANPCyT of Argentina is gratefully acknowledged. The authors also thank to Dr. M. Nazzarro for the XPS measurements.

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Authors and Affiliations

  1. Instituto de Investigaciones en Tecnología Química (INTEQUI), UNSL - CONICET, Casilla de Correo 290, 5700, San Luis, Argentina

    Fabiola N. Aguero, Bibiana P. Barbero & Luis E. Cadús

  2. Centro de Tecnología de Recursos Minerales y Cerámica (CETMIC), Camino Parque Centenario y 506, 1897, Manuel B. Gonnet, (Buenos Aires), Argentina

    Alberto Scian

Authors
  1. Fabiola N. Aguero
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  2. Alberto Scian
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  3. Bibiana P. Barbero
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  4. Luis E. Cadús
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Correspondence to Fabiola N. Aguero.

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Aguero, F.N., Scian, A., Barbero, B.P. et al. Influence of the Support Treatment on the Behavior of MnOx/Al2O3 Catalysts used in VOC Combustion. Catal Lett 128, 268–280 (2009). https://doi.org/10.1007/s10562-008-9695-y

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  • DOI: https://doi.org/10.1007/s10562-008-9695-y

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