In situ surface characterization of the intermetallic compound PdGa - A highly selective hydrogenation catalyst

K. Kovnir, M. Armbrüster, D. Teschner, T. V. Venkov, L. Szentmiklósi, F. C. Jentoft, A. Knop-Gericke, Yu Grin, R. Schlögl

Research output: Contribution to journalArticle

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Abstract

The structurally well-defined intermetallic compound PdGa - a highly selective catalyst for the semi-hydrogenation of acetylene - was characterized by Fourier transform infrared spectroscopy (FTIR) in situ X-ray photoelectron spectroscopy and in situ prompt gamma activation analysis. A strong modification of the electronic states in PdGa compared to elemental Pd was revealed as well as the complete isolation of the Pd atoms on the surface of PdGa. In situ investigations proved the high stability of the surface, thus excluding segregation phenomena (common for alloys) or sub-surface chemistry involving C and/or H atoms (known for elemental Pd). By suppressing the sub-surface chemistry, the electronic modification as well as the site isolation lead to the high selectivity and long-term stability of PdGa in the semi-hydrogenation of acetylene.

Original languageEnglish
Pages (from-to)1784-1792
Number of pages9
JournalSurface Science
Volume603
Issue number10-12
DOIs
Publication statusPublished - Jun 1 2009

Fingerprint

Acetylene
Surface chemistry
Hydrogenation
hydrogenation
Intermetallics
intermetallics
Activation analysis
catalysts
Atoms
Catalysts
Electronic states
acetylene
Fourier transform infrared spectroscopy
isolation
X ray photoelectron spectroscopy
chemistry
activation analysis
electronics
atoms
selectivity

Keywords

  • Acetylene hydrogenation
  • Fourier transform infrared spectroscopy
  • In situ characterization
  • Intermetallic compound
  • PdGa
  • Prompt gamma activation analysis
  • Site isolation
  • X-ray photoelectron spectroscopy

ASJC Scopus subject areas

  • Surfaces and Interfaces
  • Condensed Matter Physics
  • Materials Chemistry
  • Surfaces, Coatings and Films

Cite this

Kovnir, K., Armbrüster, M., Teschner, D., Venkov, T. V., Szentmiklósi, L., Jentoft, F. C., ... Schlögl, R. (2009). In situ surface characterization of the intermetallic compound PdGa - A highly selective hydrogenation catalyst. Surface Science, 603(10-12), 1784-1792. https://doi.org/10.1016/j.susc.2008.09.058

In situ surface characterization of the intermetallic compound PdGa - A highly selective hydrogenation catalyst. / Kovnir, K.; Armbrüster, M.; Teschner, D.; Venkov, T. V.; Szentmiklósi, L.; Jentoft, F. C.; Knop-Gericke, A.; Grin, Yu; Schlögl, R.

In: Surface Science, Vol. 603, No. 10-12, 01.06.2009, p. 1784-1792.

Research output: Contribution to journalArticle

Kovnir, K, Armbrüster, M, Teschner, D, Venkov, TV, Szentmiklósi, L, Jentoft, FC, Knop-Gericke, A, Grin, Y & Schlögl, R 2009, 'In situ surface characterization of the intermetallic compound PdGa - A highly selective hydrogenation catalyst', Surface Science, vol. 603, no. 10-12, pp. 1784-1792. https://doi.org/10.1016/j.susc.2008.09.058
Kovnir, K. ; Armbrüster, M. ; Teschner, D. ; Venkov, T. V. ; Szentmiklósi, L. ; Jentoft, F. C. ; Knop-Gericke, A. ; Grin, Yu ; Schlögl, R. / In situ surface characterization of the intermetallic compound PdGa - A highly selective hydrogenation catalyst. In: Surface Science. 2009 ; Vol. 603, No. 10-12. pp. 1784-1792.
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