Isolated Co2+ on the surface of diluted CoOMgO solid solutions reversibly binds oxygen, forming molecular species characterized by OO stretching frequencies in the 1160 - 1015 cm-1 range. On the basis of isotope substitution experiments and by comparison with homogeneous analogues, it is concluded that O2 is adsorbed in the O-12 superoxide form and that the diluted MgOCoO solid solutions are interesting examples of heterogeneous oxygen carriers and activators.
Surface dioxygen adducts on MgO-CoO solid solutions: analogy with cobalt-based homogeneous oxygen carriers
ZECCHINA, Adriano;SPOTO, Giuseppe;COLUCCIA, Salvatore
1982-01-01
Abstract
Isolated Co2+ on the surface of diluted CoOMgO solid solutions reversibly binds oxygen, forming molecular species characterized by OO stretching frequencies in the 1160 - 1015 cm-1 range. On the basis of isotope substitution experiments and by comparison with homogeneous analogues, it is concluded that O2 is adsorbed in the O-12 superoxide form and that the diluted MgOCoO solid solutions are interesting examples of heterogeneous oxygen carriers and activators.
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