Abstract
In this study, HZSM-5(1) and HZSM-5(2) zeolites were prepared with Al(NO3)3 and Al(OH)3 sources, respectively. Kinetic modeling of liquefied petroleum gas (LPG) cracking over synthesized HZSM-5 zeolites with different framework aluminum (Al) locations was investigated at 500–650 °C using Langmuir–Hinshelwood–Hougen–Watson theory. In a proposed LPG cracking mechanism, 26 elementary surface reaction steps including C–H and C–C protolytic cracking, hydrogen transfer, isomerization and absorption–desorption of olefins and also 2 lumped reactions for C5+ formation, were considered. Due to the existence of numerous local optimal points, genetic algorithm was employed. The estimation of kinetic parameters was performed by minimizing the mean of the sum of squares between theoretical and experimental data.
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