| abstract |
A chromium-containing fluorinated fluorination catalyst consisting essentially of (i) one or more chromium(III) compounds selected from the group consisting of chromia, chromium(III) fluoride, fluorinated chromia, and chromium(III) oxyfluorides ; (ii) one or more chromium(VI) compounds selected from the group consisting of chromium(VI) oxide, chromic acid, fluorinated chromium(VI) oxide, chromium(VI) oxyfluorides, and chromyl fluoride; and (iii) one or more zinc compounds, said catalyst containing from more than 3 to 25% by weight of zinc based on the total weight of the catalyst, in which from 1.0 to 8.0% by weight weight of chromium in the catalyst, based on the total weight of said chromium, is present in the form of chromium(VI) and the catalyst being amorphous or partially crystalline and comprising less than 8.0% by weight of crystalline chromium compounds and /or zinc based on total weight of catalyst. |