Chromium oxide compositions containing zinc, their...

B - Operations – Transporting – 01 – J

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B01J 23/86 (2006.01) B01J 37/03 (2006.01) C07C 17/00 (2006.01)

Patent

CA 2539929

A chromium-containing catalyst is disclosed which includes both ZnCr2O4 and crystalline .alpha.-chromium oxide. The ZnCr2O4 contains between about 10 atom percent and 67 atom percent of the chromium in the composition and at least about 70 atom percent of the zinc in the composition, and at least about 90 atom percent of the chromium present as chromium oxide in the composition is present as ZnCr2O4 or crystalline .alpha.-chromium oxide. Also disclosed are a method for preparing this composition comprising ZnCr2O4 and crystalline .alpha.-chromium oxide; and a chromium-containing catalyst composition prepared by treatment of the composition comprising ZnCr2O4 and crystalline .alpha.-chromium oxide with a fluorinating agent. Also disclosed is a process for changing the fluorine distribution in a halogenated hydrocarbon, or incorporating fluorine in a saturated or unsaturated hydrocarbon, in the presence of at least one composition selected from the group consisting of (i) the ZnCr2O4 and crystalline .alpha.-chromium oxide compositions and (ii) the ZnCr2O4 and crystalline .alpha.-chromium oxide compositions which have been treated with a fluorinating agent.

La présente invention concerne un catalyseur contenant du chrome, qui comprend à la fois ZnCr¿2?O¿4? et un oxyde de chrome .alpha. cristallin. Le ZnCr¿2?O¿4? contient entre environ 10 % atomique et 67 % atomique du chrome compris dans la composition et au moins environ 70 % atomique du zinc compris dans la composition. Au moins environ 90 % atomique du chrome présent sous forme d'oxyde de chrome dans la composition est présent en tant que ZnCr¿2?O¿4? ou oxyde de chrome .alpha. cristallin. La présente invention concerne également un procédé pour préparer ladite composition comprenant ZnCr¿2?O¿4? et un oxyde de chrome .alpha. cristallin, ainsi qu'une composition de catalyseur contenant du chrome, préparée en traitant la composition comprenant ZnCr¿2?O¿4? et un oxyde de chrome .alpha. cristallin avec un agent de fluoration. Cette invention concerne également un procédé pour changer la distribution de fluor dans un hydrocarbure halogéné ou pour incorporer du fluor dans un hydrocarbure saturé ou insaturé, en présence d'au moins une composition choisie dans le groupe formé par (i) les compositions de ZnCr¿2?O¿4? et d'oxyde de chrome .alpha. cristallin et (ii) les compositions de ZnCr¿2?O¿4? et d'oxyde de chrome .alpha. cristallin qui ont été traitées avec un agent de fluoration. ?¿

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