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  High-pressure X-ray photoelectron spectroscopy of palladium model hydrogenation catalysts. Part 1: Effect of gas ambient and temperature

Teschner, D., Pestryakov, A., Kleimenov, E., Hävecker, M., Bluhm, H., Sauer, H., et al. (2005). High-pressure X-ray photoelectron spectroscopy of palladium model hydrogenation catalysts. Part 1: Effect of gas ambient and temperature. Journal of Catalysis, 230(1), 186-194. doi:10.1016/j.jcat.2004.11.036.

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 Creators:
Teschner, Detre1, Author              
Pestryakov, Alexeij1, Author              
Kleimenov, Evgueni1, Author              
Hävecker, Michael1, Author              
Bluhm, Hendrik1, Author              
Sauer, Hermann1, Author              
Knop-Gericke, Axel1, Author              
Schlögl, Robert1, Author              
Affiliations:
1Inorganic Chemistry, Fritz Haber Institute, Max Planck Society, ou_24023              

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Free keywords: High-pressure XPS; Palladium; Hydrogen; Carbonaceous deposits; Surface oxide; Palladium hydride High-pressure XPS on palladium
 Abstract: In light of accumulating evidence highlighting the major effect of operational conditions (gas composition, pressure, temperature) on the surface/bulk structure of catalytic materials, their characterization should involve more and more in situ methods. We constructed a synchrotron-based high-pressure X-ray photoelectron spectroscopic (XPS) instrument, allowing us to investigate the surface and near-surface state of a catalyst in the mbar pressure range. We discuss here the surface characteristics of palladium samples as a function of gas phase (hydrogen, oxygen) and temperature. We demonstrate that the surface region of catalytic materials behaves dynamically in its composition, always reflecting its environment. For example, surface oxide can be formed on Pd(111) in oxygen, which decomposes rapidly when the gas supply is switched off. The chemical nature of carbonaceous deposits also depends strongly on the operational conditions (gas-phase hydrogen, temperature). This is the first time that an XPS investigation of palladium β-hydride was performed at RT. The possible drawbacks of using a non-UHV setup (e.g., fast carbon accumulation) are also discussed.

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Language(s): eng - English
 Dates: 2004-11-262005
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 248754
DOI: 10.1016/j.jcat.2004.11.036
 Degree: -

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Title: Journal of Catalysis
Source Genre: Journal
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Pages: - Volume / Issue: 230 (1) Sequence Number: - Start / End Page: 186 - 194 Identifier: -