Abstract
Ammonia and pyridine have different effects upon activity and selectivity of cation forms of X, Y and L-type zeolites and mordenite in methanol oxidative transformations. Ammonia is found to suppress the activity of Y and L cobalt zeolite forms and mordenite in alcohol dehydrogenation, while it does not affect their activity in oxidative reactions. Y-type zeolites with transition metal cations are promoted by ammonia for deep oxidation reactions. Pyridine increases the activity of all studied cobalt zeolite forms in oxidative dehydrogenation of methanol to formaldehyde, but the activity of mordenite diminishes in partial and deep methanol oxidation.
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