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Related Experiment Videos

Ethanol decomposition: C--C cleavage selectivity on Rh(111).

Erik Vesselli1, Alessandro Baraldi, Giovanni Comelli

  • 1Laboratorio Nazionale TASC-INFM, Area Science Park, 34012 Basovizza/Trieste, Italy. vesselli@tasc.infm.it

Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry
|September 28, 2004
PubMed
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Ethanol adsorption on Rh(111) forms distinct species. Upon heating, ethanol primarily breaks the C-C bond, yielding hydrogen, carbon monoxide, and carbon, rather than the C-O bond.

Area of Science:

  • Surface Science
  • Catalysis
  • Materials Chemistry

Background:

  • Understanding ethanol interactions with metal surfaces is crucial for catalysis.
  • Rh(111) is a model catalyst surface for studying hydrocarbon reactions.

Purpose of the Study:

  • To investigate ethanol adsorption, desorption, and decomposition pathways on Rh(111).
  • To identify intermediate surface species and determine preferential dissociation channels.

Main Methods:

  • X-ray photoelectron spectroscopy (XPS) to monitor core level spectra.
  • Temperature-programmed desorption (TPD) to study desorption and decomposition.
  • Theoretical calculations using the unity bond index-quadratic exponent potential (UBEQP) model.

Main Results:

Related Experiment Videos

  • Ethanol adsorption at 90 K yields multiple adsorbed species, including multilayer formation.
  • Surface annealing leads to ethanol desorption and dissociation.
  • Preferential C-C bond cleavage was observed, while C-O bond scission was not detected.
  • Calculations provided estimates for adsorption energies and dissociation barriers.

Conclusions:

  • Ethanol decomposition on Rh(111) favors C-C bond cleavage.
  • The study elucidates key reaction intermediates and pathways relevant to catalytic processes.