Liquid deposition modification of nano-ZSM-5 zeolite and catalytic performance in aromatization of Hexene-1

Yujun Fang; Xiaofang Su; Wei Wang; Wei Wu

doi:10.24294/can.v4i1.1330

Liquid deposition modification of nano-ZSM-5 zeolite and catalytic performance in aromatization of Hexene-1

Yujun Fang, Xiaofang Su, Wei Wang, Wei Wu

Article ID: 1330
Vol 4, Issue 1, 2021

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Abstract

The Olefin aromatization is an important method for the upgrade of catalytic cracking (FCC) gasoline and production of fuel oil with high octane number. The nano-ZSM-5 zeolite was synthesized via a seed-induced method, a series of modified nano-ZSM-5 zeolite samples with different Ga deposition amount were prepared by Ga liquid deposition method. The XRD, N₂ physical adsorption, SEM, TEM, XPS, H₂-TPR and Py-IR measurements were used to characterize the morphology, textural properties and acidity of the modified ZSM-5 zeolites. The catalytic performance of the Hexene-1 aromatization was evaluated on a fixed-bed microreactor. The effects of Ga modification on the physicochemical and catalytic performance of nano-ZSM-5 zeolites were investigated. The Ga species in the modified nano-ZSM-5 zeolites mainly exist as the form of Ga₂O₃ and GaO⁺, which provide strong Lewis acid sites. The aromatics selectivity over Ga modified nano-ZSM-5 zeolite in the Hexene-1 aromatization was significantly increased, which could be attributed to the improvement of the dehydrogenation activity. The selectivity for aromatics over the Ga4.2/NZ5 catalyst with suitable Ga deposition amount reached 55.4%.

Keywords

Nanosized ZSM-5 Zeolite; Ga Modification; Liquid Deposition; Hexene-1; Aromatization

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DOI: https://doi.org/10.24294/can.v4i1.1330