In situ formation of surface and bulk oxides in small palladium nanoparticles

Abstract

Evolution of surface and bulk palladium oxides in supported palladium nanoparticles was followed in situ by X-ray absorption spectroscopy. The surface oxide was found to be easily reducible in hydrogen...

High-Quality In Situ X-ray Absorption Spectroscopy Monitoring of the Palladium Nucleation inside the 3D Printed Microfluidic Chip

“…It should also be noted that the Pd–Pd interatomic obtained for the formed palladium clusters is similar to that of the bulk palladium foil. Although a contraction of metal–metal distances can be expected for palladium nanoparticles, this result is in agreement with our previous studies of supported Pd particles with sizes from 1 to 10 nm on various supports. − The elongation of Pd–Pd distances can be caused by the presence of H or C atoms easily forming palladium hydrides , and carbides − and expanding the lattice. A similar explanation was presented by Ciapina and co-workers who concluded that H or C atoms can originate from catalytic decomposition of the organic compounds present during the synthesis …”

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

“…3% Pd 0 and 97% Pd II O. 31 − 35 This suggests that Pd 0 remained intact under this condition, in stark contrast to Pd II O which fully reacted with the HCl. When the Pd/C was pre-reduced by saturating with H 2 gas (1 atm.)…”

“…3% Pd 0 and 97% [Pd II Cl 4 ] 2– (less accurate due to narrowed scan range to shorten scan cycle time; see the Supporting Information for details), whereas initial composition was ca. 3% Pd 0 and 97% Pd II O. − This suggests that Pd 0 remained intact under this condition, in stark contrast to Pd II O which fully reacted with the HCl. When the Pd/C was pre-reduced by saturating with H 2 gas (1 atm.)…”

Temperature-dependent hydrogen storage mechanism in palladium nanoparticles decorated on multi-walled carbon nanotubes

“…Obviously, the intensity of the oxygen peak in the XP spectrum drops after the interaction with hydrogen in accordance with the claim of Ref 47. Aram L. Bugaev et al reported that the surface oxide can be easily reduced in a hydrogen environment at room temperature [48].…”