In situ studies of Mn-oxides with catalytic properties

FIGUEROA S, LEDE E., PELUSO M., SAMBETH J., REQUEJO F

Campiñas Brasil

Workshop; LNLS 2004; 2004

Brazilian Synchrotron Light Laboratory

In situ studies of Mn-oxides with catalytic properties. Figueroa, S. J. A.,1 E. J. Lede,1 Peluso, M. A.,2 Sambeth, J. E.,2 and Requejo, F. G.11 E. J. Lede,1 Peluso, M. A.,2 Sambeth, J. E.,2 and Requejo, F. G.1 INTRODUCTION The manganese oxides, including MnO2, Mn2O3 and Mn3O4 were used in some environmental catalysis reactions for the selective reduction of NOx and CO [1] [2], oxidation of volatile organic compounds (VOCs) [3] [4] [5] and elimination of organoclorates [6] [7]. MnO2 has been reported to be among the most efficient manganese oxides for catalytic elimination of pollutants [8]. Given the catalytic interest of this phase of Mn, like the destruction of VOCs, our objective in this work is to characterize, by adequate methods (XRD, EXAFS), the nature of Mn-sites, including the catalytically active ones, in the different phases for the synthesized manganese oxides and determine the phase transformations during calcination treatments in air.2, Mn2O3 and Mn3O4 were used in some environmental catalysis reactions for the selective reduction of NOx and CO [1] [2], oxidation of volatile organic compounds (VOCs) [3] [4] [5] and elimination of organoclorates [6] [7]. MnO2 has been reported to be among the most efficient manganese oxides for catalytic elimination of pollutants [8]. Given the catalytic interest of this phase of Mn, like the destruction of VOCs, our objective in this work is to characterize, by adequate methods (XRD, EXAFS), the nature of Mn-sites, including the catalytically active ones, in the different phases for the synthesized manganese oxides and determine the phase transformations during calcination treatments in air.