Reaction between carbon dioxide and elementary fluorine

Abstract

Reactions between carbon dioxide and fluorine were examined at temperatures of 303–523 K under various pressure and mixture ratios of both gases. Reactions were carried out similarly under the existence of NaF, CsF and EuF 3. After the reaction, fluorine was removed and the reaction products were analyzed using FT-IR, GC/FT-IR and GC/MS. The major products were CF 3OF, COF 2, CF 4 and CF 2(OF) 2. The best yield of COF 2 was 11.1% under the reaction condition of CO 2/F 2 = 76 kPa/76 kPa with temperature of 498 K for 72 h in a direct reaction. The formation rate of COF 2 in the direct reaction was estimated as 0.232 dm 3 mol −1 h −1 under the reaction conditions of CO 2/F 2 = 76 kPa/76 kPa, at 498 K. In the presence of CsF, it was estimated as 1.88 dm 3 mol −1 h −1 at CO 2/F 2 = 76 kPa/76 kPa at 498 K. The activation energy of the COF 2 formation in the direct reaction was estimated as 45.7 kJ mol −1 at CO 2/F 2 = 76 kPa/76 kPa at 498 K. In addition, 24.2 and 38.9 kJ mol −1 were evaluated at CO 2/F 2 = 76 kPa/76 kPa at 498 K, respectively, in the presence of CsF and EuF 3.