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

D. Teschner, A. Pestryakov, E. Kleimenov, M. Hävecker, H. Bluhm, H. Sauer, A. Knop-Gericke, R. Schlögl

Research output: Contribution to journalArticle

74 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)186-194
Number of pages9
JournalJournal of Catalysis
Volume230
Issue number1
DOIs
Publication statusPublished - 15 Feb 2005

Fingerprint

Palladium
Hydrogenation
hydrogenation
palladium
X ray photoelectron spectroscopy
Gases
photoelectron spectroscopy
catalysts
Catalysts
gases
Photoelectrons
x rays
Hydrogen
Temperature
temperature
Oxygen
photoelectrons
X rays
Gas supply
vapor phases

Keywords

  • Carbonaceous deposits
  • High-pressure XPS
  • Hydrogen
  • Palladium
  • Palladium hydride
  • Surface oxide

ASJC Scopus subject areas

  • Catalysis
  • Physical and Theoretical Chemistry

Cite this

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.; Knop-Gericke, A.; Schlögl, R.

In: Journal of Catalysis, Vol. 230, No. 1, 15.02.2005, p. 186-194.

Research output: Contribution to journalArticle

Teschner, D. ; Pestryakov, A. ; Kleimenov, E. ; Hävecker, M. ; Bluhm, H. ; Sauer, H. ; Knop-Gericke, A. ; Schlögl, R. / High-pressure X-ray photoelectron spectroscopy of palladium model hydrogenation catalysts. Part 1: Effect of gas ambient and temperature. In: Journal of Catalysis. 2005 ; Vol. 230, No. 1. pp. 186-194.
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