Direct Observation of Palladium Leaching from Pd/C by a Simple Method: X‑ray Absorption Spectroscopy of Heterogeneous Mixtures

Herein, we show the detailed behavior of palladium leaching
from
palladium on charcoal by aqueous HCl, directly observed by X-ray absorption
spectroscopy measurement employing a simplified reaction setup. While
Pd0 is not affected by the addition of HCl, palladium oxide
in nanoparticles readily reacts with HCl to form the ionic species
[PdIICl4]2–, even though these
ions mostly remain adsorbed on the surface of activated charcoal and
can only be detected at a low level in the solution phase. This finding
provides a new aspect for control of the leaching behavior and robust
usage of palladium on charcoal in organic reactions.