Oxygen anion radicals on zeolites

Abstract

Under suitable conditions, the activation of cerium exchanged X and Y zeolites in oxygen or nitrous oxide gives rise to the formation of anion radicals O^–₂ and O^– or dianions O^2–₂ and O^2–, and presumably also O^–₃ on the zeolites. The superoxide anion radical O^–₂ has been observed on lanthanum exchanged X and Y zeolites and adsorbed diamagnetic oxygen species on calcium and iron exchanged Y zeolites. The behaviour of the individual adsorbed oxygen species was studied on these zeolites.