The interaction of dioxygen with polycrystalline Bi2O3 is studied by means of X-ray Photoelectron, IR and EPR spectroscopies. The formation of superoxide species on the surface is demonstrated, after oxygen adsorption, by the presence of a weak O1s peak at 535.1 eV, by IR bands at about 1100 cm-1, both ascribed to adsorbed O2-, and it may be associated to the formation of EPR active paramagnetic centres associated to bismuth defects.
Oxygen activation on microcrystalline Bi2O3
BARRECA, DAVIDE
1997
Abstract
The interaction of dioxygen with polycrystalline Bi2O3 is studied by means of X-ray Photoelectron, IR and EPR spectroscopies. The formation of superoxide species on the surface is demonstrated, after oxygen adsorption, by the presence of a weak O1s peak at 535.1 eV, by IR bands at about 1100 cm-1, both ascribed to adsorbed O2-, and it may be associated to the formation of EPR active paramagnetic centres associated to bismuth defects.File in questo prodotto:
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