Probing Pd-carbon interaction in Pd/C catalysts by EXAFS

A Pd-C shell at ca. 3.6 Å can be included in the EXAFS fitting to the Pd/C catalyst prepared by PdCl2 or Pd(NO3)2 impregnation. The model of precursor anchoring by surface oxygen groups is not supported by EXAFS. This Pd-C interaction was originally proposed [1] for Pd(NH3)4Cl2/C. It indicates the presence of a similar Pd-C interaction in the Pd/C catalysts from cationic, anionic, and neutral Pd precursors.