Kinetics of Selective Hydrogenation of Pyrolysis Gasoline over Pd/Al2O3 Catalyst

The macro kinetics of selective hydrogenation of pyrolysis gasoline (PG) over commercial Pd/Al2O3 catalyst is studied in an adiabatic integral fixed-bed reactor. The effects of reaction temperature, pressure and space velocity on the hydrogenation performance are investigated. The power function equation is proposed and successfully fits to the experimental data. The kinetic parameters are estimated by using the fourth-order Runge-Kutta method together with the Levenberg-Marquardt algorithm, which minimized the residual sum of squares between the experimental concentrations and the calculated values. The calculated results of diene value and bromine value are in good agreement with the experimental data in hydrogenation products, indicating that the established kinetic model is appropriate for the first stage hydrogenation of PG. The estimated activation energies of hydrogenation of dienes and monoenes on Pd/Al2O3 catalyst are 29.72 and 41.18 kJ/mol, respectively.