The surface chemistry of vinyl iodide on Pt(111)
- Univ. of Texas, Austin, TX (United States); and others
Regardless of exposure, only submonolayer amounts of vinyl iodide (CH{sub 2}CHI) decompose, either during adsorption on Pt(111) at 100 K or during subsequent heating to 165 K. The remainder desorbs molecularly. The dissociation products are vinyl (CH{sub 2}CH) fragments, an important C{sub 2} intermediate in hydrocarbon catalysis, and atomic iodine. Using the tools of surface science the authors have explored the formation and subsequent reactions of vinyl species in the presence of unavoidable coadsorbed atomic iodine. While some vinyl exists up to 450 K, there are two important and competitive lower temperature reaction channels which lead to ethylidyne (CCH{sub 3}) and ethylene (CH{sub 2}CH{sub 2}). From these results, the authors conclude that the rate of ethylidyne formation from adsorbed ethylene is controlled by the rate at which the first C-H bond in ethylene breaks, and in agreement with Zaera, the authors find that vinyl is a facile intermediate in the process. 28 refs., 12 figs., 3 tabs.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 232272
- Journal Information:
- Journal of the American Chemical Society, Vol. 114, Issue 6; Other Information: PBD: 11 Mar 1992
- Country of Publication:
- United States
- Language:
- English
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