An infrared spectroscopic study of the diatomic molecules O2, N2, NO and H2 adsorbed under different conditions on Fe2O3 has been performed. Complex patterns of absorption on both α-Fe2O3 and γ-Fe2O3 activated in O2 at high temperature are assigned to vibrations of two different chemisorbed O2 species. N2 molecules do not interact with "oxygen rich" α-Fe2O3 surfaces, but give N2O- and N2O22- species when chemisorbed on evacuated surfaces. NO molecules give complex patterns of absorption, depending on the gas pressure. Three different types of nitrate structures can be identified, as well as NO, NO- and cis-N2O2 chemisorbed species. Chemisorbed water molecules are formed by contact of H2 with Fe2O3 surfaces even at room temperature. © 1982.
Infrared studies of the diatomic molecules O2, N2, NO and H2 adsorbed on Fe2O3
BUSCA, GUIDO;
1982-01-01
Abstract
An infrared spectroscopic study of the diatomic molecules O2, N2, NO and H2 adsorbed under different conditions on Fe2O3 has been performed. Complex patterns of absorption on both α-Fe2O3 and γ-Fe2O3 activated in O2 at high temperature are assigned to vibrations of two different chemisorbed O2 species. N2 molecules do not interact with "oxygen rich" α-Fe2O3 surfaces, but give N2O- and N2O22- species when chemisorbed on evacuated surfaces. NO molecules give complex patterns of absorption, depending on the gas pressure. Three different types of nitrate structures can be identified, as well as NO, NO- and cis-N2O2 chemisorbed species. Chemisorbed water molecules are formed by contact of H2 with Fe2O3 surfaces even at room temperature. © 1982.
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