Robust dehydrofluorination catalyst with host-guest structure between VOFx clusters and MgFe-LDF

A novel strategy for the preparation of metal fluoride catalyst with medium surface acidity is reported via anion exchange and host-guest structure. MgFe-CO32--LDH (layered double hydroxide) was selected as the host and NH4VO3 was selected as the guest. After interlamellar anion exchange and pre-fluorination treatment, the MgFe-VO3--LDH is converted to MgFe-V-LDF (layered double fluorides). It exhibits high activity for the dehydrofluorination of 1,1,1,3,3-pentafluoropropane (HFC-245fa) to 1,3,3,3-tetrafluoropropene (HFO-1234ze), with HFC-245fa conversion of 93% which exceeded that of pure V2O5-F by roughly 9 times. After 50 h of reaction, no noticeable deactivation was detected. Overall, we present a potential strategy for creating effective metal-fluoride Lewis acid catalysts.