Nickel-substituted and mixtures of nickel and cobalt-substituted chromium oxide compositions, their preparation, and their use as catalysts and catalyst precursors

摘要

about 2 atomic percent to about 0.05 atomic% of chromium atoms in the chromium oxide lattice α- is substituted by nickel atoms, optionally, additional chromium atoms in the chromium oxide lattice α- is replaced by trivalent cobalt atoms ( However, the total amount of trivalent cobalt atom and nickel atom in the chromium oxide lattice α- is 6 atomic% or less), the crystalline chromium oxide α- is disclosed. Processes for making compositions comprising a crystalline substituted α- chromium oxide is also disclosed and; chromium-containing catalyst composition comprising a chromium-containing component the crystalline substituted α- chromium oxide. The molar content of at least 3 per mole of chromium nitrate (a) solution, the method, the nickel concentration of about 2 mol% to about 0.05 mol% relative to the total amount of cobalt and nickel and chromium in solution and a combined concentration of the cobalt and nickel of 6 mol% based on the total amount of cobalt and nickel and chromium in solution and having a trivalent chromium salt soluble soluble divalent nickel salt, optionally After addition of 3 moles, to the solution at least 1 mol per ammonium chromium; coprecipitated solid by an aqueous solution of trivalent cobalt salt or divalent soluble, is added ammonium hydroxide (b) in (a) and comprising placing the calcining (d) solid was dried; dried solid was the (c) recovered; recovered co body formed. The fluorine distribution in a hydrocarbon or halogenated hydrocarbon in the presence of a catalyst and; chromium-containing catalyst composition comprising being produced by treatment with a fluorinating agent and the crystalline substituted α- chromium oxide, chromium-containing component (ie, placement and / or content) method of changing the are also disclosed. The method comprises using as the catalyst a composition comprising a substituted α- chromium oxide and processed crystalline substituted α- / or chromium oxide.