DEACTIVATION OF ALKANE OXIDATIVE DEHYDROGENATION CATALYST BY DEEP REDUCTION IN PERIODIC-FLOW REACTOR

The activity loss of beta-NiMoO4 catalyst has been studied in the oxid ative dehydrogenation of propane with an operating periodic flow react or. Under severe operating conditions (i.e., high temperature and long periods of the pulses), the lattice oxygen depletion is faster than t he reoxidation one. After an induction period, carbon whiskers on the catalyst surface were detected together with noticeable amounts of cra cking products in the gas phase as CH4, C-2 hydrocarbons and H-2. Deep reduction dramatically changes the reaction path and irreversibly mod ifies the catalyst.