EFFECTOFTEMPLATE CONTENT ON THE SYNTHESIS OFSHEET-LIKE ZSM-5 AND ITS CATALYTIC CRACKING PERFORMANCE OF 1-BUTENE

Abstract

Abstract: This study systematically investigated the effects of TPAOH content during the synthesis process on the pore properties, acidity, and catalytic butene cracking performance of the obtained sheet-like ZSM-5 zeolites. The results show that within the adopted synthesis system, when the TPAOH/Si molar ratio is in the range of 0.5—2.0, all the prepared HZ5-xT zeolites are sheet-like ZSM-5 with high crystallinity. As TPAOH content in the synthesis system increases, the crystal sizes of the synthesized sheet-like ZSM-5 samples along the a-axis and c-axis increase significantly, and the mesopore volume and external surface area are also enhanced, while the Si/Al ratio of the synthesized HZ5-xT samples increases. In the catalytic cracking reaction of 1-butene, the acidic properties of the HZ5-xT samples have a more significant effect on the product distribution. The contents of C₁—C₄ alkanes and aromatics in the products increase with increasing strong acid amount of the HZ5-xT samples, whereas the contents of propene and C₅+ components decrease with increasing strong acid amount.

Key words: template, TPAOH, sheet-like ZSM-5, 1-butene, cracking, acidity, crystal dimension

References

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