- 专利标题： Nickel-substituted and mixed nickel-and cobalt-substituted chromium oxide compositions, their preparation, and their use as catalysts and catalysts precursors
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申请号： US10523226申请日： 2003-08-21
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公开(公告)号： US07504358B2公开(公告)日： 2009-03-17
- 发明人: Velliyur Nott Mallikarjuna Rao , H. David Rosenfeld , Allen C. Sievert , Shekhar Subramoney , Munirpallam Appadorai Subramanian
- 申请人： Velliyur Nott Mallikarjuna Rao , H. David Rosenfeld , Allen C. Sievert , Shekhar Subramoney , Munirpallam Appadorai Subramanian
- 申请人地址： US DE Wilmington
- 专利权人： E. I. du Pont de Nemours and Company
- 当前专利权人： E. I. du Pont de Nemours and Company
- 当前专利权人地址： US DE Wilmington
- 国际申请： PCT/US03/26327 WO 20030821
- 国际公布： WO2004/018095 WO 20040304
- 主分类号： B01J23/00
- IPC分类号： B01J23/00 ; C07C19/08 ; C07C21/00
摘要：
A crystalline alpha-chromium oxide where from about 0.05 atom % to about 2 atom % of the chromium atoms in the alpha-chromium oxide lattice are substituted by nickel atoms, and optionally, additional chromium atoms in the alpha-chromium oxide lattice are substituted by trivalent cobalt atoms (provided that the total amount of the nickel atoms and the trivalent cobalt atoms in the alpha-chromium oxide lattice is no more than 6 atom %) is disclosed. Also disclosed is a chromium-containing catalyst composition comprising as a chromium-containing component the crystalline substituted alpha-chromium oxide; and a method for preparing a composition comprising the crystalline substituted alpha-chromium oxide. The method comprises (a) co-precipitating a solid by adding ammonium hydroxide to an aqueous solution of a soluble divalent nickel salt, a soluble trivalent chromium salt, and optionally, a soluble divalent or trivalent cobalt salt, that contains at least three moles of nitrate per mole of chromium in the solution, has a nickel concentration of from about 0.05 mole % to about 2 mole % of the total of nickel, chromium, and cobalt in the solution, and has a combined concentration of nickel and cobalt of no more than 6 mole % of the total of nickel, chromium, and cobalt in the solution; and after at least three moles of ammonium per mole of chromium 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 said crystalline 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 substituted alpha-chromium oxide and/or the treated substituted alpha-chromium oxide.
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