Characterization and catalytic properties of several KMg1−xPdxF3 with perovskite-like structures for the hydroconversion of CHClF2

Several KMg1−xPdxF3 samples were prepared in aqueous medium at mild conditions (333 K) and characterized by different techniques. The enlargement of their cell parameters has been associated with the insertion of Pd into the structure. After reduction, these compounds were tested in the hydrodechlorination reaction of CHClF2. Reduced KMg1−xPdxF3 samples showed higher selectivity to the desirable product CH2F2 (80–90%) than one Pd/KMgF3 catalyst where the main product was CH3F. The upward shift of the CO adsorption bands observed from the IR spectra for the reduced palladium perovskite indicates the lower electron density of Pd obtained from the reduction of KMg1−xPdxF3 samples. This modifies the mechanism of the reaction allowing the removal of one chlorine atom and therefore, favoring the formation of CH2F2.