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International Journal of Chemical Reactor Engineering

Ed. by de Lasa, Hugo / Xu, Charles Chunbao

IMPACT FACTOR increased in 2015: 0.759

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Catalytic Pyrolysis of Difluorochloromethane to Produce Tetrafluoroethylene

Dae Jin Sung1 / Dong Ju Moon2 / Yong Jun Lee3 / Suk-In Hong4

1Korea University,

2Korea Institute of Science and Technology,

3Korea Institute of Science and Technology,

4Korea University,

Citation Information: International Journal of Chemical Reactor Engineering. Volume 2, Issue 1, ISSN (Online) 1542-6580, DOI: 10.2202/1542-6580.1065, January 2004

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Difluorochloromethane (CHClF2, R22) has been used as a refrigerant for air conditioners and a raw material for the manufacturing of fluorinated compounds such as tetrafluoroethylene (C2F4, TFE), and hexafluoropyropylene (C3F6, HFP). TFE has been produced by the pyrolysis of chlorofluoroparaffins especially, R22, in the temperature ranges of 750 - 950 °C. To improve the relatively poor yield of TFE, the catalytic pyrolysis of R22 over activated carbon supported Cu-based catalysts was investigated. The catalytic activities over the prepared catalysts were compared with those of a non-catalytic pyrolysis reaction. Alteration of reactivity as a function of reaction time was also observed. At 650 °C and 700 °C, the yield for TFE over 10wt% Cu/A.C catalyst was higher than that in the non-catalytic pyrolysis. Reduced Cu catalysts were more active than CuO catalysts and the selectivity of HFP increased with increasing the amount of Cu loading in Cu/A.C catalysts. It was found that the reduced Cu catalyst was undergoing surface modification during the pyrolysis of R22 due to the reaction of Cu/A.C catalyst with hydrogen fluoride produced during the catalytic pyrolysis. The fresh catalysts and catalysts after the reaction were characterized by XRD and EDS. The metal fluoride formed during the pyrolysis was either CaAlF5 or Ca2AlF7, or their mixture

Keywords: pyrolysis; difluorochloromethane; R22; CHClF2; tetrafluoroethylene; catalyst

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