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Temperature-dependent rearrangements and reactions of acetylene adsorbed on Pt(111) monitored in the range 125-381 K by sum frequency generation

Journal of Physical Chemistry B, ISSN: 1520-6106, Vol: 101, Issue: 33, Page: 6474-6478
1997
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Metrics Details

  • Citations
    61
    • Citation Indexes
      61
  • Captures
    23

Article Description

The thermally induced rearrangements and reactions of acetylene on the (111) crystal face of platinum were observed by monitoring the vibrational spectra of surface adsorbates in the CH stretch range with infrared-visible sum frequency generation. It was found that adsorption of acetylene at 125 K led directly to the formation of an adsorbed vinylidene species (η-μ-CCH). Upon annealing, a variety of different species were formed that included ethylidene (M=CHCH), di-σ-bonded ethylene (M-CHCH-M), μ-vinylidene (M=CCH), and ethylidyne (M≡CCH). The presence of species with CH and CH stoichiometry was strong evidence that a disproportionation reaction must occur. Above 381 K ethylidyne was the only observable species on the surface.

Bibliographic Details

Gabor A. Somorjai; Paul S. Cremer; Xingcai Su; Y. Ron Shen

American Chemical Society (ACS)

Chemistry; Materials Science

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