Process for the regeneration of a catalyst based on trivalent chromium compounds

A process for fluorinating halogen-containing hydrocarbons with HF in a gaseous phase in the presence of a catalyst, based on Cr(III) compounds optionally supported, said catalyst being regenerated by the steps comprising:

• a) treating the exhausted catalyst with a flow of air or of an oxygen/inert gas mixture, at temperatures from 350.degree. C. to 400.degree. C., until the organic contaminants disappear, and
• b) treating the catalyst obtained after phase a) for a time less than 1 hour with a flow of a gaseous mixture formed by an inert gas and from 3 to 6% by volume of hydrogen, at temperatures from 310 to 340.degree. C. until complete disappearance of the Cr (VI) compounds formed during the oxidation phase a).