Highly Selective Catalytic Hydrodechlorination of HCFC-22 under Supercritical Conditions
- Highly Selective Catalytic Hydrodechlorination of HCFC-22 under Supercritical Conditions
- 하정명; 김대우; 김재훈; 안병성; 강정원
- Supercritical; Hydrodechlorination; Catalyst; HCFC-22; HFC-32
- Issue Date
- 13th Korea-Japan Symposium on Catalysis
- Chlorofluorocarbons (CFCs) and hydrogen-chlorofluorocarbons (HCFCs) have been widely used as efficient refrigerants, but their responsibility to the global warming caused by their destroying ozone layer forced them to be eliminated based on the international agreements . Chemical conversions of CFCs and HCFCs have been attempted to produce valuable chemicals in order to avoid environmental issues created by discarding these chemicals. Heterogeneous and homogeneous catalysts are used and the reports of the highly active or selective catalytic conversions of CFCs and HCFCs have been reported. Of various CFCs and HCFCs, the catalytic conversion of HCFC-22 (chlorodifluoromethane, CHClF2) has been specifically investigated because of its abundance in the atmosphere . HCFC-22 is known to be reduced via the path of “HCFC-22 HFC-32 (difluoromethane, CH2F2) methane (CH4)” . In order to selectively obtain HFC-32, the further defluorination of HFC-32 to methane must be suppressed while the dechlorination of HCFC-22 to HFC-32 must be improved: however, many studies indicate that the high selectivity to HFC-32 can be obtained when the conversion is low .
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