Dehydrofluorination is the major process for the production of fluorinated monomers and treatment of synthetic greenhouse gases. It is usually catalyzed by the Lewis acids, such as AlF₃, MgF₂ and fluorinated Cr₂O₃. The activity and stability remain the challenges of catalysts. For metal fluorides, Lewis acidic sites are derived from the unsaturated coordination of metal sites. This work reports the confinement of AlF₃ into the cavity of quasi MOF structures. Due to the confinement effect and interaction of AlF₃ with coordinatively unsaturated Cr-O nodes (oxygen vacancy), significant amounts of 4-fold coordinated Al in AlF₃ can be achieved. Consequently, the Lewis acidity of AlF₃ could be dramatically enhanced. As the catalyst of the gas-phase dehydrofluorination of HFC-245fa (1,1,1,3,3-pentafluoropropane) to tetrafluoropropene (HFO-1234ze, a new generation of green refrigerant) at 350 ^oC with the GHSV of 750 h^-1, it exhibited the activity of 9 times higher than that of supported AlF₃. . After reaction of 35 h, no noticeable deactivation was detected. The present work provides a potential strategy for the preparation of metal fluoride Lewis acid catalysts with high efficiency.

脱氟化氢是生产氟化单体和处理合成温室气体的主要过程。它通常由路易斯酸，如AlF ₃，MgF ₂和氟化Cr ₂ O ₃催化。活性和稳定性仍然是催化剂的挑战。对于金属氟化物，路易斯酸性位点源自金属位点的不饱和配位。这项工作报告了将AlF ₃限制在准MOF结构的空腔中。由于的AlF的限制效应和相互作用₃与的AlF配位不饱和的Cr-O节点（氧空位），显著量4倍配位的Al ₃可以实现。因此，可以显着提高AlF ₃的路易斯酸度。作为HFC-245fa的（1,1,1,3,3-五氟丙烷）的气相脱氟化氢以四氟丙烯（HFO-1234ze的，新一代绿色制冷剂）的在350的催化剂^ø下以750小时GHSV ^-1表现出的活性是负载的AlF ₃的9倍。。反应35小时后，未检测到明显的失活。本工作提供了一种高效制备金属氟化物路易斯酸催化剂的潜在策略。