Interaction of acetylene with the Pd(110)(1 × 2)-Cs surface: promotion of ethylene formation

T. Takaoka, T. Sekitani, T. Aruga, M. Nishijima

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6 Citations (Scopus)

Abstract

The interaction of acetylene with the Pd(110)(1 × 2)-Cs surface has been studied by the use of high-resolution electron energy loss spectroscopy and thermal desorption spectroscopy. For a small exposure (0.2 L) at 90 K, acetylene is chemisorbed. For a large exposure (2.5 L), physisorbed acetylene and vinylidene (CCH2) are formed in addition to chemisorbed acetylene. By heating to 135 K, physisorbed acetylene desorbs from the surface. By heating to 260 K, acetylene is converted to vinylidene. Ethylene desorption takes place at 315 K. After heating to 400 K, methylidyne and carbon are formed on the surface. Compared with the case for Pd(110)(1 × 1), ethylene formation is markedly promoted on the Pd(110)(1 × 2)-Cs surface. The effects of the Cs modification are discussed. It is shown that the acetylene hydrogenation occurs via vinylidene.

Original languageEnglish
Pages (from-to)179-192
Number of pages14
JournalSurface Science
Volume306
Issue number1-2
DOIs
Publication statusPublished - 1994 Apr 1
Externally publishedYes

ASJC Scopus subject areas

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

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