Influences of Reaction Temperature and Carrier Gas Flow‐Rate on n‐Heptane Cracking over ZSM‐5 Catalyst Without and With Activation of V₂O₅/Al₂O₃

Abstract

The activation role of V2O5/Al2O3 during the cracking of heptane over ZSM‐5 catalysts has already been confirmed in our previous study. In order to get more details about the alternative reaction pathway contributed by the activation of V2O5/Al2O3, a comparative study of n‐heptane cracking over ZSM‐5 equilibrium catalyst without and with V2O5/Al2O3 introduction was performed at different temperatures and contact time. The results indicated that elevated reaction temperature weakened the role of V2O5/Al2O3 during the reaction process. While the impacts of contact time were not as strong as that of temperature, and the change of relative contribution of different reaction pathways, including thermal reaction, carbonium/carbenium ion cracking, and reaction of the intermediate species because of V2O5/Al2O3 activation, was concluded to be small at varied N2 flow rates.