KINETICS OF ISOPENTANE DEHYDROGENATION ON CHROMIA-ALUMINA CATALYST WITH CATALYST FOULING

抄録

In isopentane dehydrogenation over chroniia-alumina catalyst, the conversion of isopentane and the yield of isopentenes decreased rapidly with process time while that of isoprene did so very slowly.
Coke deposition on catalyst and catalyst fouling occurred in an integral catalytic reactor, and coke distribution was observed along the axial direction of the reactor. For isopentane dehydrogenation a kinetic model in which the main reaction was consecutive and the sub-reaction was parallel is proposed. For estimating distributed kinetic parameters with catalyst fouling, an algorithm that involves two calculating steps is introduced. Applying an activity factor which accounts for catalyst fouling and which is a linear function of coke content, the kinetic parameters were estimated. Using these parameters, the changes of the concentration and the distribution of coke content with process time were simulated fairly well.