COBALT-SUBSTITUTED CHROMIUM OXIDE COMPOSITIONS, PREPARATION THEREOF, AND APPLICATION THEREOF AS CATALYSTS AND CATALYST PRECURSORS Russian patent published in 2008 - IPC B01J23/26 B01J23/882 B01J27/132 C01G37/33 B01J37/03 B01J37/26 C07C17/20 

FIELD: isomerization and disproportionation catalysts.

SUBSTANCE: invention relates to crystalline α-chromium oxide, chromium-containing catalytic compositions, methods for preparation thereof, and to a process of fluorine distribution in hydrocarbon and/or halogenated hydrocarbon in presence of indicated catalytic compositions. Claimed crystalline α-chromium oxide, wherein about 0.05 to about 6 atomic % chromium in the lattice of α-chromium oxide is substituted by trivalent cobalt (Co+3) atoms is via coprecipitation of solid substance by introducing ammonium hydroxide, this method being supplemented by introducing an excess of ammonium nitrate into precipitated mixture before dehydration step and calcination step at 375 to 1000°C in presence of oxygen. Chromium-containing catalytic compositions containing crystalline cobalt-substituted α-chromium oxide as chromium-containing component optionally treated with fluorination agent are also claimed. Composition preparation procedure comprises: (a) coprecipitation of solid substance by introducing ammonium hydroxide into aqueous solution of soluble cobalt salt and soluble trivalent chromium salt, wherein solution contains at least three moles nitrate per mole chromium and has concentration of cobalt from about 0.05 to about 6 mol % based on total content of cobalt and chromium in solution, followed by introducing into solution at least three moles ammonium per mole chromium; (b) collecting coprecipitated solid substance obtained in step (a); (c) drying collected solid substance; and (d) calcination of dried solid substance at 375 to 1000°C in presence of oxygen.

EFFECT: increased activity of catalytic composition in above-indicated processes.

15 cl, 8 dwg, 13 ex