Kinetic study of pyrolysis gasoline hydrogenation over supported palladium catalyst

Abstract

The hydrogenation of pyrolysis gasoline was carried out over a supported palladium catalyst. Some of the operation variables which showed the effects on catalyst reduction and pyrolysis gasoline hydrogenation were discussed. The reduction conditions were studied by TPR technique and verified by the hydrogenation reaction. The supported palladium oxide could be reduced to palladium completely in less than one hour at 100°C and 4.5 atm of H 2. The sintering of palladium became significant when the reduction temperature was above 300°C. The reaction temperature which gave the maximum pseudo rate constant of hydrogenation increased with increaing pressure. The kinetics of hydrogenation of model compounds, isoprene and styrene, were also studied in a semibatch basket reactor. The increase in hydrogen pressure not only enhances the rate of hydrogenation but also depresses the polymerization of dienes. It can be concluded that the reaction temperature and pressure should be compromised in order to obtain the optimum operation for hydrogenation of diene to monoolefin.