On formation conditions of organohalogen compounds from particulate carbon of fly ash

Abstract In experiments with fly ash and model mixtures the formation conditions of PCDD/PCDF in the low temperaturede-novo-synthesis (300°) were investigated. Concentrations of sulfur dioxide, hydrogen chloride and elemental chlorine in the gas phase were varied. From the results it is concluded that in the reaction considered elemental chlorine does not play a decisive role. Furtheron the build-up of total organic chlorine (TOX), total extractable organic chlorine (EOX), as well as the oxi dative degradation of particulate carbon and its conversion to carbon dioxide was studied. Regarding the involvement of metal ions, it is shown, that besides Cu(II) also Fe(III) ions may promote these reactions. From the experimental data it is proposed, that the de-novo-synthesis at 300°C from particulate carbon proceeds through a direct ligand transfer of the halide, in which metal ions (Cu, Fe) are involved.

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