Abstract
The utilization of activated carbons as catalyst supports for the treatment of gaseous effluents contaminated with volatile organic compounds allows advantage to be taken both of the adsorption of the pollutant on the well-developed porous texture of activated carbons and the possibility of an efficient catalytic conversion. The step of catalyst impregnation should be optimized to obtain a catalyst dispersion compatible with good conversions at sufficiently low temperatures. Textural evolution when impregnation is performed either on the raw material or after activation of the latter has already been well studied. The work described in this paper was directed towards an analysis of the textural evolution of impregnated active carbons when the impregnation step was performed between carbonization and activation. To date, such knowledge is quite scarce. To allow comparison, impregnation with CoO, Co3O4 or CrO3 was carried out both after activation and after carbonization of nutshells and pinewood sawdust. F...
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