Modeling of the Regeneration of a Coked Fixed Bed Catalyst Based on Kinetic Studies of Coke Burn-Off

摘要

The coking and regeneration of a reforming catalyst was studied by physical characterization methods (pore volume, tortuosity, porosity, porosity, carbon distribution) as well as by kinetic investigations on the reaction rate of coke burn-off. For temperatures of industrial relevance for the Pt/Re-Al_3O_3 catalyst, i.e. below 550 °C (deactivation), the burn-off rate is determined by the interplay of chemical reaction and pore diffusion; limitation by external mass transfer can be excluded. Based on the kinetic parameters, the process of the regeneration of a technical reactor is discussed.