Add time:08/25/2019         Source:sciencedirect.com

The behaviour of the [36Cl]-chlorine labelled compounds, anhydrous hydrogen chloride and 1,1-dichlorotetrafluoroethane, towards fluorinated chromia catalysts has been investigated under flow conditions at 623 and 688 K respectively. In each case [36Cl]-chlorine activity was deposited on the catalyst. Uptakes of chlorine, determined from radiochemical measurements and from neutron activation analyses, were comparable for a given catalyst irrespective of the reagent used. Flow of anhydrous hydrogen fluoride at 623 K or reactions of dichlorotetrafluoroethane isomers and 1,1,2-trichlorotrifluoroethane over [36Cl]-chlorine labelled fluorinated chromia, led to the removal of 75–85% of the radioactivity. The remainder was retained even on basic hydrolysis of the catalyst. The results are discussed in terms of a halogen exchange model for the behaviour of chlorofluoroethanes and suggestions are made regarding the nature of the catalytically active halogenating species.

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