Catalytic combustion of chlorobenzene on Pt/gamma-Al2O3 in the presence ofaliphatic hydrocarbons

During the catalytic combustion of chlorobenzene on a 2% Pt/gamma-Al2O3 cat alyst, considerable amounts of polychlorinated benzenes an formed as by-pro ducts. The co-feeding of heptane practically eliminates this unwanted side- reaction. Moreover, the conversion of chlorobenzene occurs at much lower te mperatures (the T-50% drops from 305 to 225 degrees 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 h ydrocarbon cannot explain the increase in destruction rate of chlorobenzene . Removal of Cl from the surface by the alkane appears to be the ruling fac tor. (C) 1999 Elsevier Science B.V. All rights reserved.