Research Progress of Olefin Cracking Reaction Over Acid Zeolites
The cracking reaction of olefins over acid zeolites can convert C4+olefins into high-value ethylene and propylene.The research status and development trend of olefin cracking reaction were investigated.Moreover,the mechanism,kinetics,thermodynamics and catalysts of olefin cracking reaction were summarized in detail.In terms of reaction mechanism,the reaction intermediate types and reaction pathways of olefin cracking were discussed in detail.In terms of kinetics,the differences in the reaction rates of various β-scission modes were summarized.In terms of thermodynamics,the effect of reaction temperature and pressure on the equilibrium composition of olefin cracking product was mainly introduced.In terms of catalysts,the effects of pore structure,acid strength,acid capacity and acid position of zeolites on the olefin cracking reaction pathway and product distribution were summarized.Through the analysis of the research status of olefin cracking reaction,it is pointed out that the ethylene/propylene ratio is low in the process of olefin cracking reaction,and the development direction of olefin cracking reaction technology in process and catalyst regulation is also put forward.
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