Dynamic behavior of a Pt0.25Rh0.75(100) single crystal surface during NO + H2 reaction

Taro Yamada, Hideki Hirano, Ken ichi Tanaka, Jacobus Siera, Bernard E. Nieuwenhuys

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41 Citations (Scopus)

Abstract

The catalytic reduction of NO by H2 on a Pt0.25Rh0.75(100) alloy single crystal was investigated by monitoring the surface species while the reaction was proceeding. Adsorption of NO at 500 K formed an O-covered surface with p(3 × 1) structure. Enrichment of Rh on the surface induced by adsorption of O was observed, and a Rh-rich alloy surface forms the p(3 × 1)-O faster. The nature of the p(3 × 1) overlayer is discussed. The NO + H2 reaction formed a c(2 × 2) overlayer of N(a). The hydrogenated adsorbate NHx(a) was observed under the presence of gas-phase H2. The hydrogenation reaction of N(a) to NHx(a) was reversible, and faster than complete hydrogenation to NH3(g).

Original languageEnglish
Pages (from-to)1-14
Number of pages14
JournalSurface Science
Volume226
Issue number1-2
DOIs
Publication statusPublished - 1990 Feb 1
Externally publishedYes

ASJC Scopus subject areas

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

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