PRODUCT DISTRIBUTION OF MIXTURE OF 1-HEXENE AND n-HEXANE OVER DIFFERENT ZEOLITE CATALYSTS

Abstract

Abstract: The cracking tests of the mixtures of 1-hexene and n-hexane with different mass ratio (based on 1- hexane mass fraction) on ZRP, Beta, DASY and REY zeolite catalysts were carried out in a fixed fluidized bed reactor at 500℃ to investigate the rule of cracking products distribution. The contribution factors of 1-hexene to n-hexane conversion on four zeolite catalysts were calculated, and the effects of different mass ratios of model compounds on the selectivity of olefins, alkanes, isomeric hydrocarbons and aromatics were expounded. The results showed that on the same catalyst, with the increase of 1-hexene content in the model compound, the selectivity of alkanes and olefins showed an opposite trend, indicating the reaction is competitive. The selectivity of isomerization products on the four catalysts increased as the 1-hexene/n-hexane ratio increased, and the order of the selectivity was DASY-L≈REY-L＞Beta-L＞ZRP-L, which has a good corresponding relationship with the pore size of the four catalysts. 1-Hexene in the model compound promoted the aromatization reaction, but the aromatics selectivities of the four catalysts were low. The results showed that the selectivity of aromatics is related to the acid amount and strength of catalyst, the higher the acid amount and the smaller the acid strength, the higher the selectivity of aromatics.

Key words: n-hexane, 1-hexene, olefins, alkanes, FCC catalysts, selectivity

References

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