Kinetic modeling of C2–C7 olefins interconversion over ZSM-5 catalyst

• Kinetics of C2–C7 olefins interconversion over ZSM-5 catalyst were studied.
• Oligomerization and β-cracking were the predominant mechanisms for olefins interconversion.
• The adsorption effect was responsible for the change in the olefin reactivity with increasing temperature.
• The kinetic model fitted well with the experimental result.

The kinetics of C2–C7 olefins interconversion were studied by feeding individual olefin into industrial ZSM-5 catalyst at temperatures of 400–490 °C, space time of 0.0046–0.34 h and partial pressure of 13.1 kPa. A kinetic model involving oligomerization, cracking and aromatization of olefins was established. The results showed that the calculated apparent activation energy was negative for oligomerization reactions and positive for cracking reactions. The proposed kinetic model was able to predict the product concentrations in the C2–C7 olefins interconversion over ZSM-5 catalyst, with R2 values ranged from 0.969 to 0.996 for the major species.

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