Reduction of nitric oxide on the carbon pretreated Rh{331} single crystal surface; evidence for molecular CN- formation

L. A. DeLouise, Nicholas Winograd

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Abstract

The chemisorption of NO on the carbon pretreated Rh{331} single crystal surface has been investigated by XPS, LEED and SIMS. The carbon overlayer was prepared by dehydrogenation of chemisorbed C2H4. Results of NO adsorption at room temperature show that surface carbon blocks adsorption sites that normally coordinate molecular NOADS and its dissociated products, NAds and OAds, as determined by comparing to experiments performed on clean Rh{331}. Heating the surface which contains NOAds, nAds, OAds and CAds, induces a series of chemical reactions starting with the dissociation of molecular NOAds. Above 400 K, the CAds and NAds atoms combine to form CN-. The formation of the latter species is confirmed by the temperature evolution of the Rh2CN+ and CN- SIMS ion yields. The CAds species also reacts with OAds to produce CO and/or CO2. These processes occur preferentially over the desorption of N2 and O2. In general, it is demonstrated that by using the XPS and SIMS methods, it is possible to identify the reaction species present on the surface at any given temperature and to unravel rather complex reaction pathways.

Original languageEnglish (US)
Pages (from-to)79-89
Number of pages11
JournalSurface Science
Volume154
Issue number1
DOIs
StatePublished - May 1 1985

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All Science Journal Classification (ASJC) codes

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

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