Synthesis and specification of template free ZSM-5/Beta composite catalyst and kinetic modeling for the methanol to gasoline (MTG) process

The search for alternative ways to produce important fuels such as gasoline is crucial. One of these technologies is the process of converting methanol to gasoline, which will have a high economic position in the future. A common catalyst for the MTG process is the ZSM-5 zeolite, which, despite its many benefits, is rapidly deactivated. Therefore, the production of a suitable catalyst with high stability and resistance to coke deposition, is of great interest in the industry. In this study, the efficiency of a composite catalyst consisting of ZSM-5 and Beta zeolites in improving coke stability and distribution of liquid products has been studied. To reduce the costs, the two zeolites were synthesized using a template free method and using a cheap natural source like rice husk. The results showed that with the introduction of Beta zeolite, the acidity of the composite catalyst decreased, which in addition to improving the structural properties of the catalyst by creating mesopores, improved the performance in the MTG process so that on this catalyst, deactivation time increased by 60%. Moreover, the study of process kinetics using Crambeck model, which included 3 lumps of methanol / dimethyl ether, light olefins and gasoline, showed that the results of the model were in good agreement with the results of the laboratory datas.