Catalysis Today, Vol.330, 135-141, 2019
Parametric modeling study of oxidative dehydrogenation of propane in La0.6Sr0.4Co0.2Fe0.8O3-delta hollow fiber membrane reactor
Oxygen-selective mixed ionic-electronic conducting perovskite-based membrane reactor shows potential for oxidative dehydrogenation of propane (C3H8) to propylene (C3H6). This process enhances the reaction performance via simultaneous reaction and oxygen separation from air by distributing the permeated oxygen over membrane surface at the reaction side at temperatures above 800 degrees C. This work simulates the oxygen permeation behavior and reaction performance in La0.6Sr0.4Co0.2Fe0.8O3-delta (LSCF6428) hollow fiber membrane reactor. Our membrane reactor model utilizes one-dimensional, explicit oxygen permeation and five tubular reaction chamber with three kinetic expressions. The oxygen permeation flux is a function of temperature, gas atmosphere, and fiber thickness with the projected highest flux of 10.2 mL (STP) cm(-2) min(-1) through a 0.2 mm-thick fiber at 1100 degrees C. The simulation results display the attainment of optimum C3H6 selectivity (91%) at 1000 degrees C when C3H8 conversion reaches 58%. We additionally probe C3H8 conversion and C3H6 selectivity between 850 degrees C and 1100 degrees C as a function of membrane area, fiber length, and He flow rate.