NICKEL-SUBSTITUTED AND MIXED NICKEL- AND COBALT-SUBSTITUTED CHROMIUM OXIDE COMPOSITIONS, PREPARATION THEREOF, AND APPLICATION THEREOF AS CATALYSTS AND CATALYST PRECURSORS Russian patent published in 2008 - IPC B01J23/26 B01J23/883 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, method for preparation thereof, and to a process of fluorine distribution in hydrocarbon and/or halogenated hydrocarbon in presence of indicated catalytic compositions. In claimed α-chromium oxide, about 0.05 to about 2 atomic % chromium in the lattice of α-chromium oxide is substituted by nickel atoms and, optionally, further chromium atoms in the lattice are substituted by trivalent cobalt atoms, the total amount of nickel and trivalent cobalt atoms in the α-chromium oxide lattice not exceeding 6 atomic %. Claimed α-chromium oxide is prepared 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 nickel-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 bivalent nickel salt, soluble trivalent chromium salt, and optionally soluble bi- or trivalent cobalt salt, wherein solution contains at least three moles nitrate per mole chromium and has concentration of nickel from about 0.05 to about 2 mol % based on total content of nickel, chromium, and cobalt (if present) in solution and total concentration of nickel and cobalt (if present) not higher than 6 mol % on the same basis; (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