Evaluation of H-ZSM-5 Deactivation During Dimethyl Ether to Hydrocarbons Transformation Process

Abstract

Hydrocarbons synthesis using transformation of methanol/dimethyl ether is of particular interest in connection with the possibility of using synthesized hydrocarbons not only as fuel but as components for basic organic synthesis to obtain organic acids, polymers and pharmaceuticals. However, catalysts deactivation, based on surface coking and dealumination, can be considered as one of the main problems for the wide application of this technology. Deactivation kinetics modeling can play a leading role for economic assessment of this process and for development of methods for catalysts activity and stability improving. Article devoted to approval three deactivation models. Simple linear deactivation model showed the possibility of its usage only in the first parts of the deactivation process, where kinetic curves are linear. An extra operator addition to this model for determination of deactivation rate change allowed to improve model reliability. To enhance model correlation with reaction mechanism additional model was developed using chemical equations for catalysts surface deactivation. This model application allowed to improve results accuracy, however measurement of surface active sites quantity is needed for this calcula