Abstract
Series of fluorination and chlorination reactions are observed when CCl 2FCClF 2 or C 2Cl 2F 4 isomers are flowed at ca. 700 K over fluorinated chromia catalysts that have been labelled by prior treatment with H 18F or H 36Cl. These reactions result in the incorporation of the radiolabel in each component of the mixtures of C 2Cl 6- n F n that are formed. The probability of a radiolabel, [ 18F] or [ 36Cl], in a given component correlates directly with the degree to which that component has been fluorinated or chlorinated on the surface. The isomerization of CCl 2FCClF 2 to CCl 3CF 3 is an important reaction on fluorinated chromia at 700 K; [ 36Cl] tracer experiments indicate that the process is intramolecular. Isomerization of CClF 2CClF 2 probably occurs also but is less dominant in the overall behaviour observed.
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