- Highly selective metal fluoride catalysts for the dehydrohalogenation of 3-chloro-1,1,1,3-tetrafluorobutane
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For the first time, dehydrochlorination and dehydrofluorination reactions are studied on the same substrate, 3-chloro-1,1,1,3-tetrafluorobutane, employing nanoscopic metal fluorides AlF3, MgF2, CaF2, SrF2, and BaF2 as catalysts that are prepared according the fluorolytic sol-gel synthesis. AlF3 is exclusively selective toward dehydrofluorination, whereas BaF2 is 100% selective toward dehydrochlorination. The acid-base character of the catalysts is investigated and, as a result, mechanistic proposals for the dehydrofluorination and the dehydrochlorination are given. Thus, at high conversion level, selective catalysts for both dehydrofluorination and dehydrochlorination on the same substrate have been developed.
- Teinz, Katharina,Wuttke, Stefan,Boerno, Fabian,Eicher, Johannes,Kemnitz, Erhard
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experimental part
p. 175 - 182
(2011/10/18)
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- HYDROFLUOROCARBON REFRIGERANT COMPOSITIONS AND USES THEREOF
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Disclosed herein are hydrofluorocarbon refrigerant or heat transfer fluid compositions that are useful in refrigerain or air conditioning apparatus or as heat transfer fluids. The compositions of the present invention are also useful in centrifugal compressor apparatus that employ two-stage compressors or single slab.single pass heat exchangers.
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- Method of making hydrofluorocarbons and hydrochlorofluorocarbons
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A method of producing hydrofluorocarbons and/or hydrochlorofluorocarbons by using halogenated alkanes as a principal reactant. Generally, the method comprises the step of: (a) reacting a starting halogenated alkane corresponding to the formula (I): H3C—CX3??(I) wherein X is independently fluorine or chlorine, with a hydrohalocarbon adduct in the presence of a catalyst to form a hydrofluorocarbon and/or hydrochlorofluorocarbon.
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