Intrinsic Ligand Effect Governing the Catalytic Activity of Pd Oxide Thin Films

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Abstract

High-pressure X-ray photoelectron spectroscopy, mass spectrometry, and density functional theory calculations have been combined to study methane oxidation over Pd(100). The measurements reveal a high activity when a two-layer PdO(101) oriented film is formed. Although a one-layer PdO(101) film exhibits a similar surface structure, no or very little activity is observed. The calculations show that the presence of an oxygen atom directly below the coordinatively unsaturated Pd atom in the two-layer PdO(101) film is crucial for efficient methane dissociation, demonstrating a ligand effect that may be broadly important in determining the catalytic properties of oxide thin films.

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Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Atom and Molecular Physics and Optics

Keywords

  • heterogeneous catalysis, methane oxidation, palladium, PdO, (root 5 x, root 5)
Original languageEnglish
Pages (from-to)3330-3334
JournalACS Catalysis
Volume4
Issue number10
Publication statusPublished - 2014
Publication categoryResearch
Peer-reviewedYes