| 초록 |
Dimerization of tetrafluoroethylene (C2F4, TFE) over carbon supported metal catalysts was investigated to produce octafluorocyclobutane (C4F8, RC318). Carbon supported metal catalysts were prepared by a impregnation method and characterized by X-ray diffraction (XRD), CO chemisorption and N2 Physisorption. The catalytic dimerization reaction was carried out in a tubular reactor system under the temperature range of 490℃∼650℃, contact time of 0.6∼1.0 sec, TFE/N2 molar ratio of 1 to 1 and total flow rate of 300∼500 cc/min. The catalytic activity over the prepared catalyst was compared with that of the non-catalytic dimerization. RC318 was mainly produced with a little amount of by-products such as Hexafluoropropylene (CF3CF=CF2, HFP), Trifluoroethylene (CF2=CHF, TrFE), Pentafluoroethylene (CHF2CF3, R125), Chlorotrifluoropentane (CF2=CFCl, CTFE). The conversion of TFE and the selectivity of RC318 were greatly affected by the temperature and contact time.
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