Process for the removal or decrease of halogenated aromatic compounds from exhaust gases of incineration plants for waste or special waste

摘要

The invention starts from a process for the removal or diminution of halogenated aromatic compounds, in particular polychlorinated phenols or polychlorinated dibenzodioxins and polychlorinated biphenyls from exhaust gases of incineration plants for waste or special waste by thermal treatment at temperatures between 300@C and 700@C in the presence of an iron oxide-containing catalyst. The process according to the invention is characterised in that a) air and NH3 for the simultaneous diminution of the NOx contents are added to the hot exhaust gases, and b) the catalyst used is a sulphate-containing and/or phosphate-containing iron oxide catalyst. The process according to the invention has the advantage that, with simultaneous decrease of the NOx contents, even highly toxic halogenated aromatic compounds, in particular PCBs can be removed from exhaust gases of incineration plants for waste or special waste. IMAGE