A crystalline alpha-chromium oxide where from about 0.05 atom % to about 6
atom % of the chromium atoms in the alpha-chromium oxide lattice are
replaced by trivalent cobalt (Co.sup.+3) atoms is disclosed. Also
disclosed is a chromium-containing catalyst composition comprising as a
chromium-containing component the crystalline cobalt-substituted
alpha-chromium oxide; and a method for preparing a composition comprising
the crystalline cobalt-substituted alpha-chromium oxide. The method
involves (a) co-precipitating a solid by adding ammonium hydroxide to an
aqueous solution of a soluble cobalt salt and a soluble trivalent
chromium salt that contains at least three moles of nitrate per mole of
chromium in the solution and has a cobalt concentration of from about
0.05 mole % to about 6 mole % of the total concentration of cobalt and
chromium in the solution; and after at least three moles E of ammonium
per mole of chromium in the solution has been added to the solution, (b)
collecting the co-precipitated solid formed in (a); (c) drying the
collected solid; and (d) calcining the dried solid. Also disclosed is a
chromium-containing catalyst composition comprising a chromium-containing
component prepared by treating the crystalline cobalt-substituted
alpha-chromium oxide with a fluorinating agent; and a process for
changing the fluorine distribution (i.e., content and/or arrangement) in
a hydrocarbon or halogenated hydrocarbon in the presence of a catalyst.
The process involves using as the catalyst a composition comprising the
crystalline cobalt-substituted alpha-chromium oxide and/or the treated
cobalt-substituted alpha-chromium oxide.