A series of supported V₂O₅/MgF₂ catalysts were prepared and tested for dehydrofluorination of 1,1,1,3,3-pentafluoropropane (HFC-245fa) to synthesize 1,3,3,3-tetrafluoropropene (HFO-1234ze). The addition of V₂O₅ in MgF₂ resulted in up to 5-fold increase in HFC-245fa conversion (from 19.2 to 95.2%) and much enhanced catalyst stability. Characterization results revealed that the dehydrofluorination initiated on the MgF₂ support triggered the transformation of V₂O₅ to vanadium oxyfluoride (VOF_x) species via the reaction between V₂O₅ and HF, and such species were responsible for the improved activity as they had much higher turnover frequencies (TOFs) than the MgF₂ (0.762 s⁻¹ v.s. 0.026 s⁻¹ at 320 °C). The kinetic results indicated that the 3.1V₂O₅/MgF₂ had much lower activation energy (44.6 ± 1.9 kJ mol⁻¹) than the MgF₂ (69.0 ± 0.8 kJ mol⁻¹). Accordingly, reaction mechanism on the V₂O₅/MgF₂ catalyst was proposed, which included slow dehydrofluorination on MgF₂ and fast dehydrofluorination on the VOF_x species.

制备了一系列负载型V ₂ O ₅ / MgF ₂催化剂，并对1,1,1,3,3-五氟丙烷（HFC-245fa）的脱氟化氢进行了测试，从而合成了1,3,3,3-四氟丙烯（HFO-1234ze ）。在MgF _2中添加V ₂ O ₅可使HFC-245fa转化率提高多达5倍（从19.2％增至95.2％），并大大提高了催化剂的稳定性。表征结果表明，在MgF ₂载体上引发的脱氟化氢通过V ₂ O ₅之间的反应触发了V ₂ O ₅向氟氧化钒（VOF _x）物种的转化。和氟化氢，这些物种负责改善活动，因为它们具有比MgF ₂高得多的周转频率（TOF）（在320°C时为0.762 s ^-1对0.026 s ^-1）。动力学结果表明，3.1V ₂ ø ₅ /的MgF ₂具有低得多的活化能（44.6±1.9千焦耳摩尔^-1）比的MgF ₂（69.0±0.8千焦耳摩尔^-1）。因此，提出了在V ₂ O ₅ / MgF ₂催化剂上的反应机理，包括在MgF ₂上缓慢脱氟化氢和在VOF _x上快速脱氟化氢。 物种。