Kinetic studies of propene oligomerization over HZSM-5 zeolites with different acidity

In the present study kinetic of propene oligomerization reaction over HZSM-5 zeolite was studied and kinetic parameters such as rate constant and activation energy were evaluated. Initially a number of reaction were carried out over HZSM-5 zeolite with different Si/Al ratio (10-50) at atmospheric pressure, temperature in the range of 250-400 °C and GHSV=195-1170 h-1 and it was found that the highest quantity of C7+ hydrocarbons was obtained with HZSM-5 of Si/Al molar ratio=25. The zeolite with Si/Al ratio of 25 was then chosen for the kinetic study. The reaction rate was described by a power law kinetic model based on propene consumption. The reaction followed a first order type reaction and the activation energy obtained suggests that propene oligomerization was limited by mass transfer.