Redox properties of cerium‐exchanged Y‐zeolites

The oxidation of cerium(III)-exchanged zeolite NaY (exchange level 24-91%) with aqueous hydrogen peroxide and oxygen has been studied. The fraction of Ce(IV) produced decreases with increasing Ce content of the zeolites. Hydrogen peroxide is catalytically decomposed by the Ce(III)/Ce(IV) redox couple with formation of an equilibrium level of a Ce(IV) hydroxide species. Oxidation with oxygen at temperatures higher than 400 K yields an oxycerium(IV) complex. The latter NaCe(IV)Y zeolite effects oxidative glycol cleavage of 2,3-dimethyl-2,3-butanediol to acetone. Activation in oxygen restored its oxidizing capacity. Thus, the oxygen-activated NaCe(IV)Y zeolite is a regenerable glycol-cleaving oxidant. The H2O2-oxidized NaCe(IV)Y is not active in glycol-cleavage oxidiation.

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