Abstract
Physicochemical and catalytic properties of cobalt-containing ZSM-5 zeolites prepared from cobalt acetate by solid-state ion-exchange are compared as a function of the Co/Al atomic ratio. When Co/Al=1/2, cobalt is present both as ions in cationic sites and oxide particles on the zeolite; for Co/Al=1 or 3/2, TEM and EXAFS show that a cobalt phyllosilicate phase is present on the outer surface of the zeolite, but Lewis acid sites (Co 2+ ions) are still accessible as revealed by pyridine adsorption. Catalyst prepared with Co/Al=1 exhibits high activity and selectivity toward acetonitrile in the ammoxidation of ethane and ethylene. Co 2+ ions inside the zeolite and on the phyllosilicate surface seem to be the active species.
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