Effect of zeolites with different structures on the catalytic cracking performance of n-hexane
The comparative analysis of the phase,pore structure,grain morphology,and acidic prop-erties of zeolites IM-5,Al-ITQ-13,USY,and ZSM-23 with different structures was conducted,and the n-hexane catalytic cracking reaction perfor-mance of four zeolites was evaluated in a fixed-bed micro-reaction device.The results showed that all four types of zeolites were pure phases with high crystallinity,USY had the largest specific surface area,pore volume,and acidity,ZSM-23 had the smallest specific surface area and pore volume,and Al-ITQ-13 had the lowest acidity.The high conver-sion rates of n-hexane in USY and IM-5 indicated a direct correlation between acidic properties and re-action activity.And the total yield and selectivity of light olefins in Al-ITQ-13 were the highest,indi-cating that the selectivity of light olefins was closely related to acid content and pore structure.Al-ITQ-13 with suitable acidity and smaller pore size exhib-ited excellent catalytic performance in increasing light olefins in the catalytic cracking reaction of n-hexane.
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