Research progress on catalyst modification for methanol/dimethyl ether to olefins
Methanol to olefins(MTO)process is widely used in industry,but the molecular sieve catalysts used in the process still have some issues,such as high selectivity of C4+products(butene,butane,etc.)and easy carbon deposition and deactivation.Therefore,it is necessary to further explore methods to enhance the selectivity of low carbon olefins and inhibit carbon deposition.The research progress on grain size regulation,pore regulation and acid property regulation of ZSM-5 and SAPO-34,and the reaction characteristics of dimethyl ether to olefins(DTO)in molecular sieve system were reviewed.The olefins formation mechanism in the hydrocarbon pool mechanism was summarized,and the potential of using mordenite(MOR)in MTO and DTO reaction systems was briefly discussed,such as its potential to further regulate the distribution of low carbon olefins in the final products,and it is anticipated that this can help regulate the distribution of low carbon olefins in the final products.The reaction mechanisms for MTO and DTO reactions remain undetermined,and current catalyst modification schemes can provide slight improvements in product selectivity of low carbon olefins and delay carbon deposition by mesoporous structures.In the future,building composite catalysts is a direct solution to solve the problems of low selectivity ratio of ethylene and propylene and easy carbon deposition in industrialization.
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