Abstract:Pentafluoroethyl iodide(C2F5I) is not only used as the telogens for the telomerization of tetrafluoroethylene to long-chain perfluoroalkyl iodides, but also used as the raw material of intermediate for medicines and agrochemicals. Currently a continuous vapor-phase process for the synthesis of C2F5I has been developed successfully by reacting C2HF5 with I2 in the presence of an alkali or alkaline erath salt supported in activated carbon as catalyst which makes the green production become possible. In this paper, the synthesis of C2F5I via the new novel method was catalyzed by the RbNO3-KF/C catalysts prepared by the equivalent-volume impregnation method. The results indicate that the activity of RbNO3-KF/C catalysts varies continuously with time. By means of BET-BJH, TG-DTA, SEM, XRD, ICP, the deactivation of RbNO3-KF/C catalysts for synthesis of pentfluoroethyl iodide was characterized and compared with the fresh RbNO3-KF/C catalyst. The results indicate that the real active components are RbO and RbF of RbNO3, and the deactivation of the catalytic active component RbNO3-KF/C is mainly caused by the coke-formation on the catalysts during the reaction, and the loss of active components due to the imbalance between carbon deposition and carbon baking.