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 O2–2 and O2–, 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.

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