Chemisorption and decomposition of pyrrole on Pd{111}

Christopher J. Baddeley, Christopher Hardacre, R. Mark Ormerod, Richard M. Lambert*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)

Abstract

XPS, TPD and HREEL results indicate that molecular pyrrole is a fragile adsorbate on clean Pd{111}, At 200 K and for low coverages, the molecule remains intact and adopts an almost flat-lying geometry. With increasing coverage, pyrrole molecules tilt away from the surface and undergo N-H bond cleavage to form strongly tilted pyrrolyl (C4H4N) species. In addition, a weakly bound, strongly tilted form of molecular pyrrole is observed at coverages approaching saturation. Heating pyrrole monolayers results in desorption of ∼15% of the overlayer as molecular pyrrole and Ha+C4H4Na recombination with formation of flat-lying pyrrole molecules. This strongly bound species undergoes decomposition to adsorbed CN, CHx and H, leading ultimately to desorption of HCN and H2. The implications of these results for the production of pyrrole by a heterogeneously catalysed route are discussed.

Original languageEnglish
Pages (from-to)1-8
Number of pages8
JournalSurface Science
Volume369
Issue number1-3
DOIs
Publication statusPublished - 20 Dec 1996

Keywords

  • Catalysis
  • Chemisorption
  • Electron energy loss spectroscopy
  • Low index single crystal surfaces
  • Molecule-solid reactions
  • Palladium
  • Pyrrole
  • Thermal desorption spectroscopy
  • Vibrations of adsorbed molecules
  • X-ray photoelectron spectroscopy

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