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Oxygen‐Containing species on amorphous Fe 80 B 20 and Fe 40 Ni 40 B 20 alloys during chemisorption of CO and H 2
Author(s) -
Zsoldos Z.,
Schay Z.,
Guczi L.
Publication year - 1988
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.740120406
Subject(s) - chemisorption , x ray photoelectron spectroscopy , boron , oxygen , oxide , amorphous solid , metal , adsorption , chemistry , catalysis , boron oxide , inorganic chemistry , analytical chemistry (journal) , crystallography , materials science , nuclear magnetic resonance , physics , organic chemistry , biochemistry , chromatography
Our study was conducted to determine the forms of the oxygen chemisorbed during the interaction of CO and H 2 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 −4 Pa) 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 + H 2 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.