Feb 1, 2025 · Post-reaction XAS confirms the absence of significant restructuring between PdO clusters and Pd ions following exposure to Wacker reaction conditions. We further performed in situ XAS during reduction and oxidation transients to …

Oct 18, 2021 · We show that a 2D morphology of the PdO x phase synthesized with this approach is thermally stable and resistant to water poisoning, showing increased reactivity in methane oxidation.

Mar 14, 2022 · Operando x-ray absorption spectroscopy (XAS) was used to monitor the evolution of Pd and Pt during poisoning and regeneration. The studies show the formation of PdS and metallic Pd during reactivation of Pd-Pt/Al2O3, followed by transition to PdO after changing to lean reaction gas mixt.

Jan 28, 2019 · In this study, two high-performance supported Pd nanoparticle catalysts (Pd/γ-Al 2 O 3 and Pd/zeolite-Y) are investigated for NH 3 -SCO using a combination of XAFS with DRIFTS and on-line mass...

Jun 14, 2013 · The PdO-Pd phase transformation in a 4 wt% Pd/Al2O3 catalyst has been investigated using in situ X-ray absorption spectroscopy (XAS) and in situ X-ray total scattering (also known as high-energy X-ray diffraction) techniques.

Jul 16, 2021 · We show that dynamic Pd speciation changes can be monitored during reduction in the liquid phase. XRD and XAS indicated that the isothermal PdO reduction passes through an intermediate Pd 0 phase toward the formation of a well-defined Pd hydride phase.

May 1, 2024 · In summary, the redox-driven surface generation of 2D metallic Pd bumps on litchi-like PdO surface was manifested to be highly active for the methane oxidation, according to the characterizations by HAADF-STEM, quasi in situ XPS, operando XAS, and DFT calculations.

May 9, 2018 · The activation of precursor-dependent Pd nanoparticles was comprehensively followed by in situ X-ray absorption spectroscopy on two inorganic supports for rationalizing the final catalytic activity.

The PdO–Pd phase transformation in a 4 wt% Pd/Al2O3 catalyst has been investigated using in situ X-ray absorption spectroscopy (XAS) and in situ X-ray total scattering (also known as high-energy X-ray diffraction) techniques.

The Cl-based precursor, which presents high thermal stability, passes through a PdO x Cl y mixed phase when submitted to calcination on Pd/Al 2 O 3 and leaves Cl-species after metal reduction on Pd/C (which can be detrimental to catalytic reactions).