Conversion of syngas to liquid hydrocarbons over a two-component (Cr2O3-ZnO and ZSM-5 zeolite) catalyst: Kinetic modelling and catalyst deactivation

摘要

The present study describes the kinetics of syngas transformation into liquid hydrocarbons (boiling point in the gasoline range) using as catalyst a mixture of a metallic component, Cr2O3-ZnO, and of an acidic component, ZSM-5 zeolite. Experimental results were obtained in an isothermal fixed-bed integral reactor. The validity of several kinetic models, available for methanol synthesis, is analysed and modifications are proposed. These changes involve a rate equation with a CO2 concentration-dependent term. Catalyst deactivation is also evaluated and the effect of the operating conditions on coke deposition is established. Moreover, the rate of CO conversion and the change of catalytic activity with time-on-stream were described using a kinetic model showing a weak influence of temperature. (C) 2000 Elsevier Science Ltd. All rights reserved. [References: 46]