Effect of second metal on the selectivity of Mn/H-ZSM-5 catalyst in methanol to propylene process

In order to attain to the higher selectivity of propylene in the process of methanol conversion to propylene (MTP) over H-ZSM-5, the bi element catalysts were prepared by Mn/H-ZSM-5 and each of Ce, Cr, Fe, P and Ni promoters. The results revealed that the Ce–Mn/H-ZSM-5 demonstrated the highest selectivity to propylene. Response surface methodology was applied to optimize the preparation parameters (second metal loading, calcination temperature and calcination time) of the bimetallic Ce–Mn/H-ZSM-5 catalyst. Kinetic modeling is performed in the reaction temperature range of 440–500 °C and in the different weight hourly space velocities of methanol (i.e., 2.51, 4.18 and 8.37 h−1). A reaction mechanism based on the theory of hydrocarbon pool and conjugate methylation/cracking mechanisms is applied for the MTP. The hybrid genetic algorithm is employed to calculate the kinetic parameters.