Hydrogenation and H, D Exchange studies of ethylidyne (CCH3) on Rh(111) crystal surfaces at 1 atm pressure using high resolution electron energy loss spectroscopy

B. E. Koel, B. E. Bent, G. A. Somorjai

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Abstract

We have combined high resolution electron energy loss spectroscopy (HREELS) with a high-pressure/low-pressure (HPLP) system to study the behavior of the monolayer structure of stable hydrocarbon species that form on single-crystal metal surfaces during catalytic reactions at atmospheric pressure. We find that a monolayer of adsorbed ethylidyne (CCH3) on Rh(111) at 310 K does not hydrogenate to ethylene or ethane in one atmosphere of static D2. The methyl group hydrogens exchange with deuterium is a slow process. The amount of exchange depends strongly on the amount of uncovered, bare-metal surface, but little on the hydrogen pressure. A mechanism for H, D exchange involving ethylidene (CHCH3) as an intermediate is proposed.

Original languageEnglish (US)
Pages (from-to)211-228
Number of pages18
JournalSurface Science
Volume146
Issue number1
DOIs
StatePublished - Oct 2 1984
Externally publishedYes

All Science Journal Classification (ASJC) codes

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

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