Abstract
During the catalytic combustion of chlorobenzene on a 2% Pt/γ-Al 2O 3 catalyst, considerable amounts of polychlorinated benzenes are formed as by-products. The co-feeding of heptane practically eliminates this unwanted side-reaction. Moreover, the conversion of chlorobenzene occurs at much lower temperatures (the T 50%drops from 305 to 225°C). Simultaneously, the conversion of heptane is retarded. The addition of other hydrocarbons have a similar effect. Water and heat produced by the combustion of the added hydrocarbon cannot explain the increase in destruction rate of chlorobenzene. Removal of Cl from the surface by the alkane appears to be the ruling factor.
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