Radiotracer [ 18F] and [ W l ] experiments demonstrate the deposition of oligomeric chlorocarbon species on fluorinated metal oxides and trapping of hydrochlorocarbon monomers, both without loss of surface fluoride lability, thus accounting for the unusual room-temperature heterogeneous catalytic fluorination of CH3CC13 and related species by anhydrous HF.
Highly active catalysts are required for the conversion of CF 3 CH 2 Cl to the CFC-alternative refrigerant, CF 3 CH 2 F, by HF vapour under heterogeneous conditions. Chromia impregnated with a very low level of zinc(ii) is a superior catalyst precursor to chromia alone. The behaviour of prefluorinated chromia and prefluorinated chromia containing zinc(ii) or nickel(ii) towards fluorine-18 labelled HF indicates that two types of labile surface fluoride are present, only one of which is catalytically active. Proposals are made to account for the role of Zn II and Ni II .
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