Pd as a reduction promoter for TiO2: Oxygen and hydrogen transport at 2D and 3D Pd interfaces with TiO2 monitored by TPR,<i> operando</i> 1H NMR and CO oxidation studies

Yarar M., BOUZIANI A., ÜNER D.

CATALYSIS COMMUNICATIONS, cilt.174, 2023 (SCI-Expanded, Scopus) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 174
  • Basım Tarihi: 2023
  • Doi Numarası: 10.1016/j.catcom.2022.106580
  • Dergi Adı: CATALYSIS COMMUNICATIONS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, BIOSIS, Chemical Abstracts Core, Chimica, Compendex, Directory of Open Access Journals
  • Kocaeli Üniversitesi Adresli: Hayır

Özet

Ambient 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 nano -particles were further confirmed from the relative abundance of metallic Pd in 3D, deduced from hydrogen stoichiometry of beta-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.