In Situ X-Ray Photoelectron Spectroscopy of Model Catalysts: At the Edge of the 
Gap

Blomberg, S.; Hoffmann, M. J.; Gustafson, J.; Martin, N. M.; Fernandes, V. R.; Borg, A.; Liu, Z.; Chang, R.; Matera, S.; Reuter, Karsten; Lundgren, E.

doi:10.1103/PhysRevLett.110.117601

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In Situ X-Ray Photoelectron Spectroscopy of Model Catalysts: At the Edge of the Gap

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Blomberg, S., Hoffmann, M. J., Gustafson, J., Martin, N. M., Fernandes, V. R., Borg, A., et al. (2013). In Situ X-Ray Photoelectron Spectroscopy of Model Catalysts: At the Edge of the Gap. Physical Review Letters, 110(11): 117601. doi:10.1103/PhysRevLett.110.117601.

Cite as: https://hdl.handle.net/21.11116/0000-000A-D199-D

Abstract

We present high-pressure x-ray photoelectron spectroscopy (HP-XPS) and first-principles kinetic Monte Carlo study addressing the nature of the active surface in CO oxidation over Pd(100). Simultaneously measuring the chemical composition at the surface and in the near-surface gas phase, we reveal both O-covered pristine Pd(100) and a surface oxide as stable, highly active phases in the near-ambient regime accessible to HP-XPS. Surprisingly, no adsorbed CO can be detected during high CO₂ production rates, which can be explained by a combination of a remarkably short residence time of the CO molecule on the surface and mass-transfer limitations in the present setup.