Comparative study on a deactivation kinetic model based on fractional conversion of solid in fluid/solid heterogeneous processes

In this work, the definition of deactivation kinetic model (DKM) has been given under some assumptions and its features were illustrated through comparison with prior kinetic models such as DM (deactivation model), Langmuir rate equation, pseudo kinetic model and unreacted SCM (shrinking core model). DKM is based on fractional conversion of solid and concentration of fluid phase, which is one of the different kinetic models for the heterogeneous processes. DKM has no thermodynamic equilibrium quantities such as adsorption amount (q_e) unlike the previous pseudo-order models. Therefore, DKM can offer more accurate kinetic parameters than other models. Main equations of DKM can be solved by using Matlab functions such as “ODE” and “lsqnonlin”. This DKM is a semi-empirical and apparent kinetic model for fluid/solid heterogeneous processes and its kinetic equations can be used not only in heterogeneous reactions, but also in adsorption processes.

Graphical abstract