Kinetic Modeling of Acidity-Activity Relationship for Ethylene
Oligomerization and Aromatization Over ZSM-5 Zeolites
Abstract
The ethylene oligomerization and aromatization reaction kinetics on
ZSM-5 with different Si/Al ratio was modeled by the single-event concept
combined with the Brönsted kinetic model for establishing a quantitative
acidity-activity relationship. The NH3 desorption activation energy is
related to the reaction activation energy and de/protonation heat based
on the linear free energy theory by introducing γ, δ as the kinetic
parameters of reaction sensitivity to the acid strength. Total 36
parameters in the subtype elementary step level were estimated for each
kinetic model. The hybrid genetic optimization algorithm was generated
to obtain the kinetic model parameters, which can efficiently and
accurately fit the change of product distribution of for 3 three
catalysts within C8 hydrocarbon in the reaction network. The performance
of the kinetic modeling is confirmed by experimental data. The regressed
kinetic modeling can predict the influence of zeolite with same topology
and different acidity on product distribution.