| 摘要 |
PURPOSE: Provided is a catalyst for the decomposition of an organohalogen compound for efficiently decomposing aromatic organohalogen compounds such as dioxins and precursors thereof, which are contained in a very small amount in an exhaust gas discharged from waste incinerators, or aliphatic organohalogen compounds such as trichloroethylene and dichlorometahne. CONSTITUTION: The composite catalyst capable of decomposing an organohalogen compound, comprises: iron compound particles having an average particle size of 0.01 to 2.0 mu m, and having a phosphorus content of not more than 0.02%, a sulfur content of not more than 0.3% and a sodium content of not more than 0.3% each by weight based on the weight of the particles; and an amine compound. The composite catalyst having a catalytic activity such that not less than 50% by weight of monochlorobenzene is decomposed when 50 mg of a mixture comprising iron oxide-based particles, obtained by heat-treating the particles at a temperature of 300 deg.C for 60 minutes in air, and the amine compound, is contacted with 5.0 X 10 mol of monochlorobenzene at a temperature of 300 deg.C at a space velocity of 150,000 h-1 using a pulse catalytic reactor.
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