Abstract
Abstract Molecular Oxygen anion radicals (O2−) were produced on X-zeolites by γ-irradiation in the presence of O2. Their properties were systematically investigated by means of ESR spectroscopy. Two kinds of O2− species with different gz values were formed on monovalent cation-exchanged (LiX, KX, RbX, CsX) zeolites and MgX, while three and single O2− species were observed on divalent cation-exchanged (CaX, SrX, BaX) and trivalent cation-exchanged (LaX) zeolites, respectively. These O2− radicals showed different reactivities with N2O or 1-butene, and their gz values were classified into four groups. By considering the results from the gz values and the effect of introduced high pressure O2 on the O2− spectra, the adsorption sites for the radicals on zeolites were determined.
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