Kinetic modeling based on complex reaction theory for n-butane catalytic cracking over HZSM-5

Abstract

The purpose of this study was to develop a kinetic model for normal butane catalytic cracking over H-ZSM-5. Experimental data were obtained from a previous study where catalytic cracking was carried out in a laboratory scale reactor at atmospheric pressure in the temperature range of 342–498 °C. In this paper, a mathematical procedure is proposed for deriving reaction routes, overall reactions and the basic reaction routes based on the methodology of complex reactions theory, in order to describe the catalytic cracking kinetics of normal butane. A computer program developed in FORTRAN programming could execute the model automatically and MATLAB programming software to optimize the kinetic constants in order to obtain the product yields. The combined mechanism of normal butane catalytic cracking included complex reactions method and lumped model has been illustrated as a typical catalytic heterogeneous reaction. The kinetic parameters obtained from model are described by the Arrhenius equation. The model calculations were in appropriate accordance with the experimental data.