Pd/Al_F3 catalysts for catalytic dehydrofluorination of 1,1,1,3,3-pentafluoropropane

Abstract

A series of Pd/AlF₃ catalysts was prepared by an impregnation method and tested for vapor-phase dehydrofluorination of 1,1,1,3,3-pentafluoropropane(HFC-245fa) to synthesize 1,3,3,3-tetrafluoropropene(HFO-1234ze). The highest activity was obtained over Pd/AlF₃ catalyst containing 1.0%(mass fraction) of Pd, with an HFC-245fa conversion of 79.5% and an HFO-1234ze selectivity of 99.4% after the reaction at 300 °C for 100 h. The reactivity was related to the surface acidity, as AlF₃ provided active sites for the reaction. With the addition of Pd, the catalyst stability could be significantly improved. Raman spectroscopic and thermal-gravimetric analysis results reveal that there was less carbon deposit on spent Pd/AlF₃ catalyst surface because Pd could effectively pyrolyse it. Thus, Pd/AlF₃ catalysts were bi-functional for dehydrofluorination of HFC-245fa.

Keywords

Pd/AlF₃ catalyst / Lewis acid / Carbon deposit

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