Pd as a reduction promoter for TiO2: Oxygen and hydrogen transport at 2D and 3D Pd interfaces with TiO2 monitored by TPR, operando 1H NMR and CO oxidation studies
Catalysis Communications, vol.174, 2023 (SCI-Expanded, Scopus)
- Publication Type: Article / Article
- Volume: 174
- Publication Date: 2023
- Doi Number: 10.1016/j.catcom.2022.106580
- Journal Name: Catalysis Communications
- Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, BIOSIS, Chemical Abstracts Core, Chimica, Compendex, Directory of Open Access Journals
- Keywords: 2DPd, TiO2, 3DPd, Hydrogen spillover, Oxygen reverse spillover, Operando NMR, FISCHER-TROPSCH SYNTHESIS, PHOTOCATALYTIC OXIDATION, PD/TIO2 CATALYSTS, PARTICLE-SIZE, ADSORPTION, MICROSCOPY
- Middle East Technical University Affiliated: Yes
Abstract
© 2022Ambient temperature reduction of TiO2 surface was observed through hydrogen spillover from Pd nanoparticles with a hydrogen consumption stoichiometry of 1.4 H2:Pd up to ≤2 wt%Pd loading. This behavior was attributed to the formation of nanoparticles exhibiting 2D behavior for ≤2 wt%Pd loading. The 2D behavior of Pd nanoparticles were further confirmed from the relative abundance of metallic Pd in 3D, deduced from hydrogen stoichiometry of β-PdHx. EPR revealed oxygen vacancy formation, operando NMR revealed facile hydrogen spillover, and CO oxidation reaction rates systematically increased for Pd ≤ 2 wt%, indicating facile exchange of hydrogen and oxygen at 2D Pd/TiO2 interfaces.