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

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2023-01-01

Author

Yarar, Melis
Bouzani, Asmae
Üner, Deniz

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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 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.

Subject Keywords

2D Pd/TiO2, 3D Pd/TiO2, Hydrogen spillover, Operando NMR, Oxygen reverse spillover

URI

https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85143864348&origin=inward
https://hdl.handle.net/11511/101427

Journal

Catalysis Communications

DOI

https://doi.org/10.1016/j.catcom.2022.106580

Collections

Department of Chemical Engineering, Article

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Citation Formats

M. Yarar, A. Bouzani, and D. Üner, “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, pp. 0–0, 2023, Accessed: 00, 2023. [Online]. Available: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85143864348&origin=inward.