Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor
Reexamination Certificate
2004-10-13
2008-10-14
Andres, Janet L. (Department: 1621)
Catalyst, solid sorbent, or support therefor: product or process
Catalyst or precursor therefor
C570S154000
Reexamination Certificate
active
07435700
ABSTRACT:
A chromium-containing catalyst is disclosed which includes both ZnCr2O4and crystalline α-chromium oxide. The ZnCr2O4contains 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 ZnCr2O4or crystalline α-chromium oxide. Also disclosed are a method for preparing this composition comprising ZnCr2O4and crystalline α-chromium oxide; and a chromium-containing catalyst composition prepared by treatment of the composition comprising ZnCr2O4and crystalline α-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 ZnCr2O4and crystalline α-chromium oxide compositions and (ii) the ZnCr2O4and crystalline α-chromium oxide compositions which have been treated with a fluorinating agent.
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Amos Tammy Georgette
Rao Velliyur Nott Mallikarjuna
Sievert Allen Capron
Subramoney Shekhar
Andres Janet L.
E.I. du Pont de Nemars and Company
Lao MLouisa
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