Kinetic modeling of side reactions in propane dehydrogenation over Pt-Sn/γ-Al2O3 catalyst

The kinetics of side reactions in the dehydrogenation of propane over a supported platinum catalyst modified by tin, were investigated. Catalytic dehydrogenation over a commercial Pt-Sn/gamma-Al2O3 was carried out in a laboratory-scale plug-flow reactor at 580-620 degrees C under atmospheric pressure. Several kinetic models derived from different reaction mechanisms were tested using experimental data obtained under a range of reaction conditions. It was found that the kinetics of the main dehydrogenation reaction was best described in terms of a Langmuir-Hinshelwood mechanism, where the adsorption of propane was the rate controlling step. Simple power low rate expressions were used to express the kinetics of side reactions. (C) 2011 Sharif University of Technology. Production and hosting by Elsevier B.V. All rights reserved.