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Kinetics of the fluorination/chlorination of 1-chloro-1,2,2,2-tetrafluoroethane

Journal Article · · Journal of Catalysis; (United States)
 [1]
  1. Du Pont Co., Wilmington, DE (United States)
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The kinetics of the catalytic fluorination and chlorination of 1-chloro-1,2,2,2-tetrafluoroethane (HCFC-124) by HF and HCl to give pentafluoroethane (HFC-125) and 1,1-dichloro-2,2-trifluoroethane (HCFC-123), respectively, were examined in order to further define the mechanisms of these reactions. An HF-treated preparation of 2% CoCl[sub 2] on Al[sub 2]O[sub 3] was used as a catalyst. Reaction of deuterium-labeled HCFC-124 With HF or HCl showed the deuterium to be retained in both reactant and products, suggesting the absence of carbenoid or olefinic intermediates in these halogenations. Thermodynamic and thermokinetic properties of these halogenations were also determined in order to determine the extent of contributions of reverse reactions to the kinetics of these halogenations. Kinetic studies indicated that these halogenations are consistent with a classical Langmuir-Hinshelwood mechanism where both HX (X = F or Cl) and HCFC-124 are adsorbed on identical active sites of the catalyst in the rate-determining step. 17 refs., 5 figs., 5 tabs.
OSTI ID:
5621600
Journal Information:
Journal of Catalysis; (United States), Journal Name: Journal of Catalysis; (United States) Vol. 142:1; ISSN 0021-9517; ISSN JCTLA5
Country of Publication:
United States
Language:
English

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Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CATALYSIS
CATALYST SUPPORTS
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHLORIDES
CHLORINATION
CHLORINE COMPOUNDS
CHLOROFLUOROCARBONS
COBALT CHLORIDES
COBALT COMPOUNDS
DEUTERIUM
DEUTERIUM COMPOUNDS
FLUORINATION
HALIDES
HALOGEN COMPOUNDS
HALOGENATION
HETEROGENEOUS CATALYSIS
HYDROGEN COMPOUNDS
HYDROGEN ISOTOPES
ISOTOPES
KINETICS
LIGHT NUCLEI
NUCLEI
ODD-ODD NUCLEI
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
REACTION INTERMEDIATES
REACTION KINETICS
STABLE ISOTOPES
THERMODYNAMICS
TRANSITION ELEMENT COMPOUNDS