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- W1796194064 abstract "Dismutation of CCl2F2 (CFC-12) was studied at a reaction temperature between 275°C to 450°C at atmospheric pressure over MgO modified chromia-alumina catalysts. More than 50% selectivity towards CClF3 (CFC-13) was achieved over coprecipitated 10%Cr2O3-4%MgO-86%Al2O3 catalyst. The fresh and activated catalysts were characterised by BET surface area, X-ray diffraction, electron spin resonance (ESR), coke content and temperature programmed desorption (TPD) of ammonia. There was no deactivation of the catalyst due to the coke formation during the 60h of continuous steady-state operation. Thus MgO appeared to minimise the coke formation as evidenced from the ESR and TPD of NH3 of the fresh and used catalysts. With increase in temperature, formation of CCl4 increased which might be due to the involvement of CCl3F in the secondary dismutation reaction. A mechanism for primary and secondary reactions of dismutation of CCl2F2 has been proposed based on the heats of formation of CCl2F2, CCl3F, CClF3 and CCl4. This model reaction can be extended for the dismutation/isomerization of C2-CFCs to synthesize fluorine rich compounds with near zero ozone depletion potential (ODP) values. These compounds form intermediates for hydrofluorocarbons (HFCs), the leading candidates to replace the existing chlorofluorocarbons (CFCs)." @default.
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- W1796194064 date "1998-01-01" @default.
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- W1796194064 title "Effect of method of preparation on the dismutation activity of CCl2F2 over Cr2O3-MgO-Al2O3 catalysts" @default.
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- W1796194064 doi "https://doi.org/10.1016/s0167-2991(98)80314-5" @default.
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