Oxygen‐Containing species on amorphous Fe80B20 and Fe40Ni40B20 alloys during chemisorption of CO and H2

Z. Zsoldos, Z. Schay, L. Guczi

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Our study was conducted to determine the forms of the oxygen chemisorbed during the interaction of CO and H2 with FeNiB and FeB alloys in both amorphous and crystallized states using photoelectron spectroscopy. Four different kinds of oxygen were observed to exist on the samples based upon O Is binding energies (B.E.), that is, 530.1 ± 0.2 eV, 531.0 ± 0.2eV, 531.5 ± 0.2 eV and 532.0 ± 0.2 eV. The first peak is probably related to bulk iron oxide while the last one correlates directly with the occurrence of boron oxide species. The second peak is believed to be the signal of a weakly chemisorbed surface oxygen species in atomic state covering the surfaces after room temperature and low pressure (10−4Pa) oxygen adsorption. It can be the possible precursor for deep oxidation of metal. The third peak may be assigned to the oxygen species stuck to the boron‐metal interfaces having migrated from the metal surface to the surrounding boron atoms. Thereby small metal ensembles can be stabilized. In an ealier work it was established that the highest catalytic activity in the CO + H2 reaction can be related to the partially crystallized FeNiB alloys. It was supposed to be due to a special surface structure hindering the formation of the inactive graphitic species. In the light of the present study his structure can be stabilized by this boron oxide.

Original languageEnglish
Pages (from-to)257-261
Number of pages5
JournalSurface and Interface Analysis
Volume12
Issue number4
DOIs
Publication statusPublished - Jul 1988

ASJC Scopus subject areas

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

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