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The freshly prepared Pd NPs were characterized by transmission electron microscopy (TEM, Figure 1) and their catalytic activity directly tested in the hydrogenation reaction of cyclohexene at 50 °C and 1 atm of H2 (Figure 2) for 24 h. The tested conditions displayed a good performance and the desired product was obtained in 50 % yield. It is worth noting that this reaction is usually carried out at higher temperatures and pressures. It is important to notice that no significant difference was observed in the NPs size distribution after catalysis (before catalysis, (4,08 ± 2,56) nm, and after catalysis (3,67 ± 2,04) nm, shown in Figure 2), which we attribute to the stabilizing effect of the ionically-tagged ligand.

Palladium nanoparticle catalysts in ionic liquids: synthesis, characterisation and hydrogenation of alkenes with an ionically-tagged ligand