Zeolite catalysts for catalytic cracking of hydrocarbon to increase light olefins selectivity
Light olefins such as ethylene and propylene are the most important basic raw materials in the chemical industry.In recent years,the global demand for light olefins has continued to increase,and the development of technology to increase the production of light olefins through catalytic cracking of different raw materials will remain the main direction.In this work,we focus on the efficient production of light olefins by catalytic cracking process and the research progress in the preparation and catalytic cracking performance of zeolite catalysts,especially in the synthesis and performance modulation mainly based on ZSM-5 zeolites is reviewed.For the increase of production of light olefins,ZSM-5 zeolites by using diversified synthesis method are provided,its modulation of texture and acid properties of ZSM-5 zeolites by modification with different elements,preparation of hierarchical porous structures are introduced,and the effects on feedstock conversion,light olefins selectivity and catalyst stability are emphatically discussed.The structure-activity relationship of catalytic cracking over the ZSM-5 catalysts to increase the production of light olefins is summarized and elucidated.Finally,the new ways for improving the regulation of light olefin distribution by precisely regulating ZSM-5 zeolites is further prospected,which lays the foundation for designing key catalysts for catalytic cracking hydrocarbons to produce light olefins.
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维普
